MakD,
It is hard enough as a rated EC135 pilot to get a machine to do training on, so unless you known an owner who will let you use their machine (a couple in the NW) for the entire course I think you will struggle to get hold of one. Insurance may as add to the cost. You will also need a FTO with EC135 on its books and an available FI. About as available as an EC135 to train on. If you want twin training the AS355 would be a better option as there are lots around and FTOs will have them on their books and FIs available.
My advice would be to train on the Jetranger which is cheaper and simpler. It will also teach you to be a more considerate pilot due to its limitations.
I used to teach basic students on the AS350 and it was simply too powerful and stable for them to develop an understanding of limited power and flying smoothly to conserve power.
Good luck with your training.
FNW