I changed the drop outs on my old steel MTB, not a bad job to do to be honest, I also had enough room to fit 700c wheels in the frame too!
If you post a pic of your current dropouts I can help suggest a suitable track end replacement and any old welding / small engineering works should be able to fit them for you, its a relatively simple job of chopping the old drop in half then heating and removing them, then brazing the new piece in, you may have to trim and file the new drops to fit, but its not a bad job.
I changed the drop outs on my old steel MTB, not a bad job to do to be honest, I also had enough room to fit 700c wheels in the frame too!
If you post a pic of your current dropouts I can help suggest a suitable track end replacement and any old welding / small engineering works should be able to fit them for you, its a relatively simple job of chopping the old drop in half then heating and removing them, then brazing the new piece in, you may have to trim and file the new drops to fit, but its not a bad job.