I don’t know SP or how its shortcuts work, but did you check if you already have those shortcuts assigned in plasma’s global shortcuts? The easiest way is to assign them to any plasma global shortcut and see if it tells you there’s a conflict.
If that’s not it, can you trigger those SP actions with an external command? Then you could do it through plasma global shortcuts.
I don’t think apk would check multiple files for the world. But you could maintain them outside the apk mechanisms, just concatenating them into a single file, with tup/make/sh/whatever.
APK/Alpine is great! And the Edge repos are well stocked.
Chimera Linux seems to be using even newer apktools than Alpine, not sure what the deal with that is. But that distro is still in early stages with limited repos for now.
Pacman/makepkg/Arch is great too, and an obvious consideration for your usage, curiously omitted from your post.