Most of the "minimum gear" Chewbacca guides started with "have G12 Bossk carry you" and I couldn't find many using Greef and Mando even though they're two of the better BHs so I decided to see what I could do.
Didn't really expect to win with G9 but that's what I'd needed for 6* (with 6* Bossk) but it only took three tries for the enemy to spread the damage around my Mandos and give Bossk a turn. Bossk taunted, Han had dropped stealth so Mando called Boba to assist, Bossk did a mass assist and then died but Boba's aoe was enough to trigger payout and things went smoothly from there. Chewy and Lando still had stealth so finished off Han, Disintegrated Leia, killed R2, Lando, Chewy. I wouldn't take that as a scientific kill order, though. Just try to get payout and let Jango, Greef, and Mando take it from there.
Hope any leveling players find this useful or at least as a fun thing to do.