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I've heard of people using a Droid on Boost, but I don't know how they did it. Might be best to Google that while you wait from a reply here. Also might want to do a search in the regular Droid forum, I'm pretty sure I've seen it come up there in the past.
If you can get it activated (I think this is unlikely) you would need a PRL to use that would give priority to Sprint SIDs, or use only Sprint SIDs, since Boost is Sprint. There may be other aspects that would be more difficult to get working - like 3G. On my previous phone with Sprint, I modded it to use a customized Verizon PRL and activated it on Page Plus (a Verizon MVNO), but it would still only work with 1x.
Your best bet is probably to ask in a forum dedicated to the carrier you want to switch to.