Honestly, you guys are mechanical wizards!I used an empty 22LR case epoxied on a 10/32 stainless bolt. Lock tite it in to the hole I drilled and tapped in the old mag release.
For me though, as an owner/operator of a small business, I have to weigh time spent vs time lost (not producing income.) In this conundrum, I bought an extended delrin replacement for $7. Took ten minutes to drop in.