Hmm interesting....I hadn't thought about the DTPIII. The only problem I'm seeing with using Boba is that I don't really think he'll get very many hits in on Vader before he closes in. If I shoot at Vader, he'll just use Deflect, and then he gets Dark Armor after that. So, Boba is likely to only do about 20-30 damage before Vader closes in enough to start whacking away at Palpatine. Hopefully, by maneuvering carefully Palpatine would be able to get a Lightning attack off at least once before he is based to Vader. My worry is once Vader and Palps are based against each other. Vader is going to get an almost guaranteed 90 damage per round (he has to roll 1's to miss). On the other hand, Palpatine has to roll 8s to hit Vader at all, and will only do 60 damage if he hits all three AND if Vader misses his block save.
Vader starts with 140 HP, if Boba puts 30 on him, and Palps gets a lighning hit off, then Vader will have 80 left. Granted, that's an average of two rounds of attacks for Palpatine to off him, but I think it would be close, and definitely up to a crucial initiative roll. Of course, I guess I could always use Boba as a meat shield for Palps. Put Boba up front and force Vader to chew through him first, while Palpatine fries Vader with Lightning from behind.
At the moment, I'm leaning more towards Boba and Palpatine, but mostly because I expect other people at our venue to run Vader JH.