Hi,
I hope you are all well in these troubled times..
I came across this real time midi controller company and I thought it may be of interest to some of you (I'm sure many of you are already aware - but I'd never heard of them). They look really interesting for using multiple controllers at the same time when you are lacking ports:-
https://www.youtube.com/watch?time_continue=183&v=CwG-4xpEli8&feature=emb_logo
and https://www.audiofront.net/MIDIExpression.php
I hope its of use to somebody - Keep safe!
Barry