This is not possible. Programs can only be loaded from external controllers by sending PC messages. Example: Send PC #5 to load the 5th Programs from the playlist.
You can use MIDI CCs to increment/decrement and load Programs, but this won’t work to load the P/A/B Program in Bank Mode.
The intended use for Bank Mode is to use the onboard footswitches to select from the 3 Programs in each bank.
It looks like the Suhr MIDI controller responds to PC messages, and the H90 can output PC messages, so you may be able to accomplish your setup that way. You will need to configure the Suhr so that certain PC numbers from the H90 switches to the correct amp channel.
