I've had some decent river fish, mostly chub, on a maggot clip loaded with dendrobenas, I also put one on the hook to disguise it a little.
Don't forget you can pop worms up by injecting them with a little air from a small bore syringe.
I think Van Der Eynde do a liquid worm flavour (probably others do too), you could combine this with chopped worm and a little groundbait, I'd probably go for a dark coloured one, until you've gota dry enough mix for PVA.
Or just use a wetter mix with a small open ended feeder.