If there was a customisable shortcut available for 'permanently delete from computer', would you use it and e.g. map [Del] to perform that action?
Yes, that would be quite a nice solution - personally I tend to use the delete key anyway.
Tbh, I also quite liked your idea of separate commands in the right-click context menu ('remove from library' vs 'delete from computer') and mapping these actions to hotkeys could also be good. But I do understand the inclination not to increase the number of options any further here.
I am not going to be storming the Bastille over this issue - equally voicing my opinion and querying whether 'deleting from computer' option is the minority action.