What about rebasing onto wine anyway?
In the end its more work to always cleanup.
If you've already made a custom build, why not submit a PR?
These patches are included in Proton 4.2-1. Is anyone opposed to closing this issue?
proton 4.2-1x1 2019-03
https://github.com/wine-mirror/wine/commit/ed75a7b3443e79f9d63e97eeebcce2d2f40c507b#diff-556449596eac325214e3d355dfaa9826
https://github.com/wine-mirror/wine/commit/b9af36933fdf47cbbe139626e98750da72142dce#diff-556449596eac325214e3d355dfaa9826
https://github.com/wine-mirror/wine/commit/3c329e28d9ffabacdf1a3075a1dab27f68b1a9fe#diff-556449596eac325214e3d355dfaa9826
these fix the high corecount issue with games like skyrim se and fallout 4 hanging infinitely at save loading/new game loading on systems with processors like the Threadripper 1950x. also fixes the neverwinter launcher. tested and working on my custom build.