I can see that the Canadian company Creative has started selling Monogram Console, can you see how it could work with Unify and in what configuration.
I contacted Monogram Creative Consoles back in March, to enquire about their developer support options. Dev support is free, provided I buy the controllers at full price. (No thank you, too expensive.)
I did learn that Monogram's own Monogram Creator software (which is free) allows setting them up as MIDI Continuous Controllers (CC); this is all that is needed for connecting them to Unify's Macro knobs.
If you like the Monogram controllers and can afford their prices, go ahead and buy whatever combination you like, and use Monogram's software to assign different CC numbers to each one. (Orbiter modules use two different CC's, one for X and one for Y.) Then assign matching CC numbers to Unify's macro knobs as described in Unify manual.
I initially looked at Monogram CC as you can assign any MIDI CC to it but like Shane said it's way too expensive for what it does. The 3-sliders/faders are nice for controlling dynamics and expression especially for orchestral plugins like Spitfire Audio. However, I was able to do more with a sustain pedal (toggle a parameter On/Off) and two expression pedals (control dynamics, expression and vibrato). This allows both hands free to play the entire span of the keyboard with advanced chords/inversions, 7ths, 9ths and 11ths, etc.
Thanks Shane for the comment, I find it expensive too, I prefer nanokontrol2 and nanoKontrol Studio.