Yes I have [tried wetted feed], and the little stinker refuses it.![]()
Freshly wet feed doesn't have the same texture as something that's been sitting a little longer (compare cashews cooked in a curry to cashews dropped from the packet into a cooked curry). If you wanted a super-smooth mixture, you could make up a mash, leave it overnight, and then hit it with a blender. It wouldn't have to ferment overnight, just soak. I rather suspect you'll have to get your own blender if you want to dunk it in something fermented.
Even if you keep the mash in the fridge overnight, add a dash of vinegar. Nothing much will happen to a fresh mix, but you want it to happen in a mildly acidic environment.