I would say that SARMs would be perfect fot this, I have used thermos and used sarms to preserve muscle and It worked really good. I have never used t3, so I cant really coment on that.
I'd research this one hard bro. T3 can cause some serious lean tissue loss if you're not carefully balanced. SARMS S-4 looks great and may be prove to be the beginning of a whole new era. It will likely lead to the holy grail of cycling - a true bridge. But I'd try to find some logs and be careful!