More excellent Retrokits problem solving with the RK006 compact MIDI hub. its a MIDI interface with 10 MIDI ports using mini-jacks using breakout cables, so you can tailor to suit the stand your gear uses.
Working in client or host mode
With 2x MIDI inputs (merged)
and multiple outputs and plenty of filtering and clock output options.
All configured via the browser and Web MIDI.
Clever stuff - should be available soon (end of the year) priced at €129