Stripped splines.

[Grizz]

I have a well used Bucher TM -850 , sold in north america as a Jacobsen G 4x4 Plus . the input spline on the belt adapter stripped out, mostly the female side. the new generation of parts desk people just give blank looks. it is 3/4''26 spline, so far no luck finding a replacement socket. I have wrapped the shaft in hard shim stock and pressed it back together.
What do you think the chances of success are?? one other thought that crossed my mind is to make a collar , heat the collar to soft and press it on to the shaft, hoping that , A it would broach splines into the collar, and as the collar cooled it would release enough that I could remove it and weld it in place of the stripped socket.