Every single remaining TIE fighter should be seen returning to is base ship after Bespin to avoid any confusion as to how they can be deployed in the Battle Of Endor.
This should be underlined by lines of dialogue from all the pilots along the lines of ,"We are about to return to our Stardestroyer, make sure I have a warm cup of blue milk ready".
It shouldn't take less than a couple of hours and only slightly interfere with the music cues of the score.