Well its a lot of hours in a short time... equates to flying minimum of 2 a day - doesn't sound much but as someone who did ppl from 0 to around 50 in 4 weeks and flew home same day as checkride I can assure you it is!
Allowing for tech problems, weather, some relaxation, checkout, etc you re more likely to be flying 4 hrs a day - thats a lot in R22!
But I d still say go for it, you're in a good position for negociating a favourable rate... I can give you name of some one who maybe be able to help if you PM me and don't mind going to California.
I m biased but would put money on it that you ll enjoy the favourable flying atmosphere. But check other threads on the requirements for getting FAA licence based on UK one before commiting to anything.
PW