+ 1 on Bar-Sto...I used to have one of their 38 Super [Nonte] barrels for my S&W 659...Great shooter...(wadcutters only)...
(It seems to have grown legs and walked away)...
7.65 Luger in an M1911...I think there was such a chambering offered by Colt at one time (maybe for foreign police orders?) but I can't be sure...
Recoil spring should be no problem; 9mm should work...
Relining a 9mm or 38 Super barrel to 7.65...Hmmmm...I don't like the sound of that...Maybe LugerDoc's gunsmith could do it...
Bar-Sto sound like the best idea...Take out a second mortgage; you'll need it...