I just got the Kriega bags. Bit of a hassle but you can strap them in, tie them on, harness them up to about anywhere you need to.
Getting on the bike, I kind of swing my leg over the back of the seat to get on, so a big bag / case there would be an additional hinderance towards convenience, and I don't really see a way around that. YES it would be really nice if the Eva had a rack like the Experia does so you can hard case it, that bike would be totally tits awesome for making deliveries !! but sadly, unless you goto a welding shop, and get a custom one done, which honestly is NOT that expensive, a hundred bucks or so maybe?.. there is nothing readily available.
Check local welding shops, the older established ones tend to have very talented people who can make racks for just about anything, out of anything, so they can do aluminum, stainless, whatever you want and probably not that expensive either.
Aaron