Actually, Jayne reached out to me after my post in the Dev update thread. KUDOS to her. https://forums.flightsimulator.com/t/official-discussion-september-9th-2020-development-update/451041/13
I had been digging in the common base AP files to see what hack I could come up with, but gave up. This should be a quick fix on their part which hopefully make it into the upcoming HF.
BTW, have you noticed changing the altimeter just reverts to what the wx engine is currently at? With either Live Wx or unreal wx mod I’ve noticed if you try and change baro it starts to change, then just reverts to current conditions in sim. Both on master and backup gauges. If others are having this issue maybe another bug thread needs be started?