What he committed was a non-pardonable (at least not by himself) crime.
He solicited election fraud at the state level. That makes it a state offense. That makes it impossible for the Mango Mussolini to pardon himself or have Pence pardon him. I believe the governor of Georgia has that power...the same governor that Trump has been dragging mercilessly on Twitter.
So you do the math. ¯\_(ツ)_/¯