Welcome to this forum! Just had a quick look at your script, it looks cool!
The only way that is currently available as far as I know, doesn’t even involve MIDI Remote in reality. One can use MCU commands for step-browsing through plugins either in inserts, strip or sends. You can even browse instruments this way. This involves adding a Mackie device, have a second pair of (virtual) MIDI ports attached to it, and then send from your MIDI Remote the needed commands.
If you want to give this approach a try, you can download and inspect one of my scripts. For example, Arturia Keylab MK2 Custom Midi Remote Script ( MKII ) , Novation SL MkIII (MK3) MIDI Remote Script .
If you search the code, you’ll find areas where I share the ways to execute such actions.
Currently, I’m playing a bit with another approach, which makes the process doable without the MCU implementation, however, we need to create an external utility for properly fetching the available effects. This looks more promising, since for example we can even populate displays with multiple effects to choose from, but as said, it depends on external handling.
I will provide more info on this approach once I’m convinced it’s working as expected in different environments. And of course, it would be very cool if Steinberg implements an alternative as an addition to the MR API.Which is why I suggest that you tag your thread as a feature-request 
Anyway, here’s a small video demonstrating this approach:
