Worm smoothies sound like a great idea! I didn't want to use my nice vitamix, and chopping the scraps up took more time than needed. I throw the scraps as is, somethings they eat fast and some, like you said, take a while to break down. If I see a cheap blender at a second hand store, I'll be sure to snatch it up and give it a try. It's fine now, but would be nice to speed the system up a little bit during the growing season.
We're constantly on the lookout for cheap blenders, as we're using them in our quick-and-easy handmade paper making workshops with kids, so we usually have at least 2-3 non-food blenders around.
And blending really speeds things up not just for the worms, but also for the drainage of the fluids. Before we started blending, the ready material was always super wet, you can squeeze water out of it (granted, we probably added not enough carbon material, but still). The smoothies allowed for a quicker draining and a dryer vermicompost. We still had to add some "brown" material though - we used leaf mold, as it is readily available in a nearby semi-wild park.