I have seen, mostly in the UK, 'chum boats' or 'bait boats'. sounds like what you want. not too fast, but carries like, 5 lbs of chum bait in 2 different chambers. They seem pretty expensive, but the design may give somebody an idea.
http://www.baitboats.com/ there have been several requests online. I have been tempted to try one, I may still ( I can be pretty creative ) but it wouldn't look nearly so nice. (not quite anyway) The principles should be simple, just a matter of doing it. I would use a trimaran hull though, using the space inbetween the hulls for storage of the bait. ( easier to drop, rather than roll a bin over the side). Heck, if nobody else responds, I'll see how much I can make one for. Let me know if you are interested. Sean