If you are willing to spend some money and can find someone to do it you can cut the old dropout off and use some of the larger dropout assys from Paragon Machine to replace the cut portion of the SS and CS

https://www.paragonmachineworks.com/

https://www.paragonmachineworks.com/...12-mm-hub.html

https://www.paragonmachineworks.com/...ets-12-mm.html

https://www.paragonmachineworks.com/...omponents.html

Bike Fab Supply also has some dropouts that would work

https://www.bikefabsupply.com/rear-dropouts-thru-axle