Chum is messy by design. Your best bet for non messy chum is to look at ground bait recipes they use in the UK for rough fish like tench and such. You might be able to use a plum oil or other fruity oil, but you're having to reinvent a wheel that has long been perfected.
Personally I would use flour and fish oil to make some kind of dough chum, but again fish oil is nasty smelling. That's really the whole point of chum. The fish don't know that it's messy to you. They just know there's something that smells good to them.
You have to think from their perspective. If the process of preparation is messy then it's messy. You have to ask, "Am I willing to do whatever it takes to catch the fish, even if it means getting messy?"
Last edited by WillieRip; 06/14/17 09:28 PM.