There are a variety of MIDI devices that will work, so it is really up to what type of controller and what functions you are looking for.
Since the Rose shares a MIDI/exp input, you’ll need a MIDI controller that has an expression pedal input if you want to keep using your expression pedal. You will also need a MIDI converter box that goes from MIDI DIN to 1/4 to work with the rose.
The chain would be Expression pedal > MIDI controller > MIDI converter box > Rose.
This is an example of a simple 3 button switch that has an exp input: https://www.disasterareadesigns.com/shop/p/dmc-3xl-gen3
This is a MIDI converter box that would work with the Rose: https://www.disasterareadesigns.com/shop/p/midi-box-4