Is the reason you don't want Desktop in Alt+Tab, because of it interfering with cycling through windows you've minimized, and back?
IF SO: add these three commands to AutoHotKey, which allow you to still have Desktop entry in alt+tab, but with keyboard shortcuts, allows you to restore, in order, the windows that you minimize (in order):
Substitute My Win+S and Win+A and Win+X input keys for whatever you like. Full info, see my thread on the 'solution' here.
(N.B. I know this isn't direct answer to question, but I would normally make this a comment. However I just joined superuser and aint got 50 rep, and it's possible or even probable for my info to be either a solution for the aswere's overall problem, or other people searching on the internet like how I got to this page.)