@audphile1 The Okki Nokki has a choice between small and large platters. I use the small one that supports in the label area. Roughly 4 inches across, the same size as the clamp. The vinyl grooves touch nothing.
Even the used albums I buy are free from pebbles and twigs, so there is nothing of significance that is going to be caught in the felt. I have owned a VPI for years and years, and never once had a scenario you concocted come up. The user can lift the wand out of the machine, and inspect and rinse the felt pad you know.
My decision to use a vacuum dry process is two fold. One its much quicker, and gets the vinyl drier. If you leave a record out long enough to air dry, you are allowing dust to deposit again. My ultrasonic machine has a fan dry stage, and that works well, but that is still time consuming.
Secondly, I am not convinced that all particulate is pulled off a record in an ultrasonic bath, or that a small amount does not flat and redeposit when the record is removed from the bath. A final rinse and vacuum step removes that possibility.