Converting everything (twice) is overcomplicating things imo. Just get a blokas midihub, process midi coming from your synth and send it back out as cc's. You can f.i. generate random values on every incoming midi note. Just keep in mind: midi will never be as smooth as cv. If you really wonna go with a module, check ORN8 (O_c Teensy4.1 running Phazerville). Full midi support.