The mlr apps I know all rely on Monomeserial, and I am quite sure that you won’t get a Grid running under Monomeserial plugged into an Owl. But considering that all mlrv-channels share the same clock and that the Owl is offering 5 cv ins and 1mb of memory, you could build a 4channel mlrv-clone and control each with a different channel from the white whale.
The more I am writing about, the more I am feeling to give it a try