"this is probably not a good idea because he is likely to CRASH hard post cycle because of the powerful nature of the roid and its very short half life."
I disagree strongly with this. if proper ancillary drugs are used when coming off, a short half-life drug is preferable, as the quick clearance will let you get about the business of recovering natural test production. Alot of guys I know who prefer long lasting self-tapering drugs are from the old school before clomid use became common...in that instance yes, a mild long lasting steroid might cause less a crash.
yes fina is very androgenic, and it will shut down your nuts FAST. I did a 2 week "finasol" (tren mixed with androsol) cycle as my first cycle, and did not use clomid when I went off (since I stupidly bought into the bill roberts 2 weeks does not suppress the hpta and tribex works as well as clomid bullshit.) recovering from that was not fun. Later I ran some "real" cycles with tren and came off with clomid, armidex (by suppressing estrogen post-cycle you will negate negative feedback to the hpta...this is true even if you were running a non-aromatizing steroid, as post-cycle there is an estrogen rebound regardless(which is why some guys get gyno AFTER a winstrol cycle)).
tren is fine for your friend as long as he is willing to take the daily shots and comes off correctly. there has been alot written here on how to come off gear. if you want i can give you the links to those threads later when I have a chance.