Welp, the JL Cooper MSB+ arrived. As great as it may be in a hardware setup, it appears that it can only filter all controllers at once, with no way to filter out a single CC, so that's out. At least, I can try using it with an external sequencer and play around with it.
Also, as far as I can see, I can't use MIDI-OX as an I/O device within Studio One, so that's out.
Looks like I might be on the hunt for another 88. However, I have a really difficult time playing on any other weighted/hammer action other than my RD1000, or perhaps a MIDIBoard. Anything else feels too heavy, stiff, slow, sluggish, or all of the above. May have to settle for a semiweighted.