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If you have the money for the 3.3kw diginow charger, you could replace your onboard with it.
Then you get your 80% charging automatically.
No need to carry external.
always slightly faster charging (a good thing, being discharged is more harmful than charging fast in most cases)
You can turn it up or down as needed via your phone.

I think it would not just hit all your requests, but also exceed them.

Thanks.
I have considered the Diginow option, but I have not been able to know if it can be put on an FXS, and, in case the answer is yes, how it should be installed. It seems that it is not a feasible solution when you are in France...

It can be, and it can go in the case as you're mentioning. It will come with a Mennekes Type 2 inlet standard for Europe. Send me an email at morgan@diginow.it for more info.

I have finally found a solution that matches all my wishes 
- fast charger (3.3kW when used at the maximum power)
- that I can use only when I need it, i.e. not fixed to the bike, but transportable in the top case or elsewhere
- that plugs easily to the input current source on one side, and to the bike on the other side
- not too heavy (5.44 kgs with connectors and a 1 meter long Anderson cable), nor bulky
- that I can use alone, or with the inboard charger of the bike
- that can be used on a domestic plug 220V/16A
- that can be used on a weak domestic plug 220V/10A for instance, or less (configurable "on the road")
- that can be used on Mennekes Type 2 plugs (charging stations)
- that can charge to full charge (100%) or less (80% for instance), and configurable "on the road"
- waterproof and insensitive to vibrations

After examining many solutions, I have decided to buy my charger from Otten (Germany), where I got very kind advices and support, and where I could get the charger with all its wiring and connectors adapted to my wishes.
Otten proposed me two solutions:

• A 3.3 kW charger "ready for use". You plug it on 220V/16A domestic plug on one side, and on the Anderson (brown) connector on the other side. You can use it with the charger of your bike at the same time
• The same charger, but controlled by CAN-bus

Both chargers are waterproof, shock-proof (in fact they are the same as Diginow, Elcon, TC Charger HK-J,...).
I decided to opt for the second option, since the CAN-operated charger can be controlled and programmed externally, which offers more possibilities.
Some people use Arduino's to control their chargers (you can for instance find information on Lennart's Github, but since I have not used Arduino's myself before, I chose another option.

I am controlling the CAN-bus charger using the ThunderStruck EVCC-Basic Controller. They provide a detailed PDF manual with many useful instructions about the way to wire it and to configure it. At page 6 of their manual, you can see that it can store 4 user-configurable settings and can easily switch from one to another (it only needs a contactor with 4 positions, addressing 4 different resistances). Thunderstruck support was very nice, and I was surprised to be asked, at the time I was buying it: "How would you like that we configure your controller?"  . I asked for:
- mode 1: 116.2V and 32A (full charge, draws 16A on the 220V plug)
- mode 2: 116.2V and 20A (full charge, draws 10A on the 220V plug)
- mode 3: 109V and 32A (about 80% charge, draws 16A on the 220V plug)
- mode 4: 109V and 20A (about 80% charge, draws 10A on the 220V plug)
And it works as is. Perhaps I will make more fine settings later, but these 4 are already pretty nice.
Note that the controller needs a 12V feeding, that is supplied by the charger itself. The 4 wires between the charger and the controller are: Ground, +12V, CAN-L, CAN-H.

Here are some pictures. I still have to get a 4 positions commutator (instead of my ugly piece of plexiglass with 4 plugs), and a box to put everything inside.

I also have considered to buy the charger in China, but
- communication with the Chinese sellers was difficult
- some sellers do not wire the charger, some give connectors that are not standard
- buying an Anderson connector would have cost 40€ with shipping !
- in some cases, you probably have to pay custom taxes
- the Thunderstruck controller has pre-programmed addresses for the charger (they are used for the CAN-bus protocol). They are not alterable, and you must be sure that the charger has one of these addresses. Otten sent me the address of its charger before selling it to me, and I could check that it was compatible with the Thunderstruck controller
That is why I think that buying the charger from Otten is a better option, at least in my case.

It seems that sending this kind of chargers from Europe to US does not make sense. US residents can also buy them from ElCon. They are the same.

wow, great alternative I guess for diginow.
Still I will continue with the new bellypan and one 3,3kW.

But for the expansion of two more 3.3kW in the bellypan this would be great, I mean: Germany is like 'on the block' with the Netherlands 

Can't wait to finally go really touring on the Zero like any ICE bike (with 9,9kW charging while having a break)

The model should be the HK-J-H132-32, 3.3KW UHF CAN bus charger.

You can contact Elcon from their website (I did it and they answer).