Actually…… MIDI could do the trick.
Try assigning the rate to a MIDI CC# message. If your MIDI pedalboard allows to program MIDI CCs for any switch, you could have the sme CC# assigned to 2 switches. You need to program different range values for each switch.
If the max value set in Eclipse patching is 4 Hz, the first switch should send out a CC with value 127 to reach 4 Hz. The second CC should send out the same CC# with a value of 64. It's a bit tricky, but may work.