I use a Peavey PC1600X (16 sliders+16 switches+etc…). Not sure if it's still made though. Worked always perfectly with all my Eventides. SysEx strings programming is well supported.
You can choose any CC on any MIDI channel.
My advice is to upgrade to H7600 or H8000 anyway as you'll get tons of more useful presets and modules and future upgrades….. and better control of system functions owing to resolved bugs in these later products.
best
I
