I've been considering a hand brake conversion too, I'd like to plumb it in after the ABS pump so I can use it to lock up the rear wheel off road and then keep the foot brake so I can hold the bike still and keep the brake light lit while keeping my hands free.
I went for some generic off road hand guards but they got bent up from the crash so I replaced them with Oxford Premium ones, they won't protect as much if I hit a tree but they do a better job at redirecting the wind, look better, and there's less clutter on the bars. Don't bother with axle sliders, I bought some but they don't even touch the ground with the bike laid down (the handle bars and foot peg touch first).
The bulbs are H4, I went with Nighteye brand ones. Whatever you go for you need to make sure they're symmetrical (some designed for cars will have tabs designed to block some light on one side) and that the mounting plate is removable (because of the large heatsink you put the retaining plate of the headlight over the mounting plate of the bulb, then insert the bulb). Don't even attempt to fit it with the headlight still mounted, just undo the four bolts holding it on for easier access. For tyres I went with Dunlop Trailmax Missions, to me they perform better than the stock tyres on and especially off road and should supposedly last longer, my rear was done after like 4000 miles.