It’s possible to map the whole range of Garmin dials and buttons with streamdeck with this handy plugin:
This is my PFD page (same layout with the MFD)
You can grab the necessary mods from flightsim.to
I personalized a G1000 MFD/PFD preset that I think came with the mod.
It requires a bit of tinkering, but it’s doable.