This is the main ‘problem’ with the Rev2 for me - scrolling through presets live is a pain and I avoid it - in fact I didn’t use it live until I found a satisfactory solution...
After much searching, and even considering trying to build a controller myself (

), I found an iOS app called MIDI Macros.
You can set up buttons to transmit program changes, or other messages, and for me it works really well.
Runs on iPhone with Prophet attached through USB directly to Apple camera kit for MIDI comms. I also use a USB hub and control a Zoom MS70CDR pedal, which also receives program changes (lovely with Rev2, but very noisey when mains powered). MIDI Macros sees both the Rev2 and Zoom as separate MIDI interfaces, and will send different commands/programs to each.
I’ve not found a way of doing program + or -, so each button sends a specific program change, which works for me.
I’m trying to attach a photo showing it setup, but it won’t so you’ll all just have to believe me!!
Andy