Connecting class-compliant MIDI interfaces?

[Lizard of Oz]

There's tons of inexpensive class-compliant MIDI interfaces with multiple inputs and outputs (e.g. the Nektar MIDIFLEX4, Miditech MIDIface 2x2 / 4x4 / 8x8, ESI M4U eX and M8U eX), which could be used to add MIDI DIN ports via the USB hub. 

I found nothing in the Compatibility Tracker, has anyone successfully tried any of those with the MRCC?