How do I hide the BTT touchbar with a modifier?

I'd like to use a modifier (say, Shift) to see the custom app touchbar. I know that it's possible to permanently hide the BTT touchbar and only show it when a modifier key is pressed, but I need completely the opposite. I've found a mention of it being possible here but I can't figure out how to do it.
I'm using a heavily modified GC preset if that matters.

I (hopefully) could help you out in the main thread (for later continuity).

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