Since Whatbox allows you to SSH into your seedbox, you can setup slskd manually (root not required) and access its WebUI remotely.
This tutorial is pretty good as an introduction to modding APKs:
https://old.reddit.com/r/ApksApps/comments/oat3qu/tutorial_how_to_modify_apk_files_for_premium/
The example used is unlocking premium features but the principles are the same for disabling DRM.
Torrminatorr has a Linux section with quite a few games, including GOG releases.
Nice, love to see more alternatives in this space. I’m currently using GlazeWM, which provides an i3-like experience on Windows. To the ones saying ‘just switch to Linux’, I used Linux full-time for many years but switched back to use Windows-only software, and a tiling WM and a package manager like Scoop goes a long way in making it more bearable.