12: Secure Boot on Surface Pro 4 with Pop!_OS
I think I'm overthinking this. I think I'll follow the instructions for Secure Boot for the Linux Surface project and see how that goes.
The GH project's wiki references following steps outlined in the ArchWiki.
Additionally, I came across the following sources:
I haven't been able to sit down and try this — but expect that this worked if I don't come back to follow up.