Just use the GSXR?!
You’ll be fine in my opinion… i commute in on the 'blade and it is fine.
Dont worry bout getting caught going supersonic… as trust me, no matter how heavy your right hand gets, its gonna be rush hour and so many cages around between the 100s of sets of lights that you cant be all that silly anyway… of course you are gonna go quick now an then - but unless you want to rode a 50cc scoot - thats always gonna be on the cards…
Personally, im gonna prob get a 125 (innva or ps125) for when the salt goes down, and also cos the missus wants a little run around etc… and can get both of those less than 2yrs old for around the 1100 quid mark… so it depends what you want mate…
But in all reality some of the ones on your list are gonna be less practical than the GSXR - IN MY OINION - i just shifted my VFR800 - was sht in town - absolute sht… too big, too cumbersome, hated it… just my opinion.
whatever you go for, try it on your route to work… and compare it to the GSXR… in the mean time - try a week on the GSXR into work - you never know - you might find it tolerable - and then you can put the £1k into something else?