Condition on birds is the key thing
Being a carby there are no worries with the loom fix. Mileage really isn't a problem on the bird. Bar risers are a good addition, Scottoiler. if it was fitted in the price then cool but I'm not sure I would buy one now doing less touring. Some people love them so have them fitted as a first thing type a thing.
The top box, if you are just top box and not pannier then a givi monorack or sw motech kit should help. If you use the monokey top plate, it will accept givi monokey and Kappa boxes. Depending on the helmets, 48 litre upwards works best for 2 lids. John mentions the wobble, this does not happen on all birds and when it does happen it tends to be when you take the hands off the bars when the top box is on. Normal for a bike designed to aero to around 180mph then put a brick on the back.
Sometimes however other things have been found to be the cause so in matter of cheapness start off with tyre pressure, always 42psi no matter what make or the load, then get the tyres balanced, headset bearings is worth checking next and of course tyres. This is a thing that is not as big as it sounds. My zzr 1400 had the same thing, the amount of bird owners who have toured for years shows how well they are sorted for two up and touring.
Beyond that
hid lights on dipped are a massive improvement and some are now moving onto led's
Fender extender
An aftermarket seat helps as some see the standard like cardboard
10/40w semi synth oil
linked brakes work okay, work better with braided hoses and some prefer to de link
led bulbs for the backlighting of the clocks improves readability
Jaws motorcycles pretty much can supply whatever you need at a fair price
and David Silver spares seems to be able to get Honda stuff when needed
Everything else will be covered by search, enjoy your bike.