@oldaudiophile,
Re-reading your post, I am not sure why you feel your CleanerVinyl pump/filter with the P60H would be virtually impossible. The pump/filter is (electrically) OFF during the first 10-min while the tank is in auto frequency change mode. Then during the next step, 10-min at 80-kHz-pulse mode the pump/filter is (electrically) ON. With a 6L tank and a 1.5 lpm pump, the tank half-life is 2.8-min, and after 10-min, the tank will be filtered 91%. At the end of the 10-min, you would want to run the pump/filter for another 4-min so that the tank was ~97% filtered for the next set of records.
As far as purchasing another set of CleanerVinyl components to accommodate two UCMCleaner which would cost some $800, there are some options.
Isonic offers a 1-micron filter FTR01-P | iSonic® 1 Micron In-Water Filter for P4875II+MVR, P4875-NH+M – iSonic Inc. for $60 that would probably work with the 40-kHz as a rinse tank. There are not a lot of details for this filter, but the rinse tank is not as important for filtration, and for the rinse tank you would run the pump with the ultrasonics.
There are many inexpensive spinners such as this one for $70 - Amazon.com: WEWU ROUNDS 12" LP 7" EP Vinyl Records Bracket for 6L Ultrasonic Cleaner Simple Version(No Ultrasonic Cleaner) : Electronics. The 1-6 rpm range is fine. When rinsing it is really ultrasonic assisted rinsing, and spinning a bit fast is OK. The only disadvantage is that you would need to remove the records from the CleanerVinyl spinner and then place them on the rinse-tank spinner, and your dry method where you raise the records is not available. However, there is a more expensive version $170 that can do that - Amazon.com: WEWU LP Vinyl Record Brackets for Ultrasonic Cleaning 1-5 Records Per Batch Raising Descending Auto-Drying(No Ultrasonic Cleaner) : Electronics
So, there are some lower cost options if you wanted to go with a 2-tank system.
Otherwise, the P60 with its dual frequency and variable power is a 2-step process, with each 6-10 minutes, for a total of 12-20 min. If using a single step, such as your 40-kHz, you don't try to equal the same total process time, only the time for one-step which is why I said not much benefit above 12-min recalling you want to use even numbered time at 0.5 rpm for even record exposure.
Good Luck,
Neil