Apologies, new to the forums, hence did not notice post originated in Mac section. Thanks
i believe there is a hidden option of forcing trash to empty with the Option key, maybe this is already in use by you or still too long lol, but:
Press and hold the mouse button on the Trash icon in the Dock to display the context menu for Trash
Press and hold the Option key or the Shift-Option keeyboard combo
Select Empty Trash from the context menu for trash
Release the Options [or] Shift-Options keys currently p[ressed and held
Or if it was Move to Trash keystrokes you were looking for as i think on a second read, tried setting it to a Function key? though keybd shortcuts require modifier keys too, you can go to;
Keyboard and Mouse > Keyboard Shortcuts add shortcut to Finder for Move to Trash
And there's the keystrokes notched down