I don't mean to be rude either, but that seems a bit narrow-minded.
The points you make sound like assumptions (maybe they're not. perhaps you've looked into Broncos with more detail than I have, or maybe you put them together or something). Now, even if your points are true, I just don't see why it matters. I find that people are quick to call something a bad idea because it's not something they would do.
If a bass might get turned into firewood, why not a cheap bass? A Bronco's $150 new. That's not a lot of money (comparatively speaking) to risk on a bass experiment if things go wrong.
I don't think that a Darkstar would sound bad in that (or any bass). It is possible that he could have a really cool looking, really unique sounding bass. If it doesn't work out, he still has a Darkstar, to use elsewhere.
The whole idea is so rock and roll, I can't believe that anyone would try to talk Andy out of it.
EDIT: After reading this, I realized that I sound like I don't believe that Bronco's aren't a budget bass. Oops. I know that is true. Remember, beauty is in the eye of the beholder.