In my humble opinion a Sterlingworth with ejectors, even with cut barrels, would be worth restoring properly. Not to make any money on it but just to preserve the Fox heritage. If it were me, I would not be trying to cut any corners, doing my own smithing or attempting to jerryrig anything. If I were so inclined I'd find another real beater to play with. It's not my gun and, of course, you are free to do anything you want with your gun. I'd send it to a trusty Fox smith.