Sorry, long time since I used a liquidizer as twins are now nearly 3, the only other option is a small blender, I had a tiny blender, specially for baby foods, that was quiet, only about £15 but that only did cooked veg, not fresh fruit drinks, although my ds2 didn't like that, we had to shut door, place twins in different room and put music on when I blendered their dinners, (obviously taking 2 adults to be present)
I hope you find a happy medium here, you're obviously trying hard to think of someway round this, but I wouldn't worry too much about food intake.
I had to do a food diary for dd3 (under hv) as she was underweight, and I was so shocked at how much she did actually eat, I recorded everything that passed her lips, right down to half tspns of food, it all adds up. You'll be surprised if you tried it! have a go, you have nothing to lose!
Good luck, keep us posted!