Definitely onto something, I think even previous drafts of RotJ had more going on with Boba and I can imagine when there was still going to be an Imperial city Boba could have done some nice jetpacking espionage, maybe we could have had some combination of the prequels Coruscant night chase with OT style speeder bikes except through skyscrapers instead of trees. After Jabba dies it should be all the more motivation for Boba to continue to track Luke, beaten up but escapes the Sarlaac. Luke can still give himself up, it just doesn’t have to happen on Endor, they’re back on the Death Star in the end anyway so it depends on how you choose to rearrange the elements if you mean to rewrite. It would be tricky to not retread ESB though, I’d personally try to work with that by making Boba do a fun double cross arc like a reverse Han moment where he sabatoges the Imperials for his own mercenary chaotic means when he either can’t get his bounty or they try to betray him with a firing squad to cut off loose ends now that Vader has Luke, Boba gets an action beat taking out a stormtrooper army with ease, if you want to cut Endor entirely we can kill two birds with one stone and take it all to the city, Boba blows up the shield generator in an act of renegade defiance and leaves like an antihero riding off into the sunset.