Jollins for Vassell (plus maybe a little extra draft compensation coming our way) would be a pretty nice swap. We shave off 3 years of Devin's deal, get someone who can slot into that 4th option, and is significantly better defensively (though Jollins D numbers are worse than I thought they'd be).
CraftedNBA has a really nice tool to sort 3&D players that shows you their SQ Index and DPM on the summary table. Good way to quickly identify trade prospects.
https://craftednba.com/player-traits/three-n-dee