And if only it was all that simple

but I get your sentiment
I've no direct experience of illicit IV drug use but have known people who have developed a needle fixation, rituals around the ROA of a substance can be as, if not more difficult to shake off.
I don't know what the rules around the IV program you mention, I'd be surprised if they didnt carry out tests to ensure you arent using anything else but I'm in the UK and things may well be different. Your thinking ATM doesnt seem yet to be in the right place to gain much from a program like that, I find it hard to see how you would gain any real benefit in the long term by going on such a program and continuing to pin yourself with coke.
I guess its all about what you really want to achieve, it doesnt sound like your happy the way things are ?