It's really not a big deal to go to a PF. Any a/c shop can knock out the hoses quickly and finding a way to mount the fans is really no big deal either.

That said, R12 seems to be taking a pretty steep drop in price. I have reverse converted a couple of systems with great results. You need to thoroughly flush, replace the filter-drier and recharge, but it will give you good results and cold air.

Good luck,