Hi roswellj,
1) It´ll survive. All maintenance work isn´t very complicated, although you´d have to change oil every 3000 kms. As Scotty mentioned, maintenance in the beginning is a little more intense and there is a running-in-period that´ll change the bike to the better, so it would be nice if you could start with ca. 1500 kms or more on the clock. 800 kms/day is pretty heavy though, on any bike.
2) Well, 100 km/h average is very amitious for a 28 hp ride, I´d even would say that for a bike twice the power. A Bullet´s top speed is about 130, but acceleration becomes train-like over 120. I guess that´s not enough, if you need 100 average it´s necessary to do a good amount of distance with 140 or more, as you have to eat or pee once in a while.
3) An amperemeter. There is is tendence for cables for chaffing and the connectors...sometimes don´t like to connect, so a meter could be helpfull. A battery is nice aswell, as these injection bike don´t utter another word without a working battery.
4) The warranty is dependent on the laws in your country, so there are big differences. You should ask the Australian importer.
The UCE engines differ in details, the only main difference is the kick starter. C5 has none, E5, G5, B5 & C5 Chrome do have one.
I´d like to show my respect for your ambitious endeavour, and wish you all the best and good luck. Please announce the data of the Leukaemia foundation you mentioned, maybe some folks here would like to contribute. As cancer is a well known disease in my family I will certainly be among them. Best regards
Maturin