There’s a very simple, yet terribly useful Simple Car Vent Mask Hanger design in the catalog by @Janerlea
The catalog image (cuz of course I forgot to take pictures before I gave them away):
and in use by my Mom and sister
I imagine these would make great branded “business cards” in this day and age!
The only warning I’d include is, if you make them from hardwood, be sure to run the grain along the clip length because there’s a reasonable amount of pressure generated.