Solution found for the stem-mount clock, utilizing the prior Beeline Moto mount.
This is a photo of nav pod mounting head disassembled; the twist-lock pod mount portion and the tiny screw are not needed for this solution, just the swivel head piece on the left with the captive nut:
This is a closeup photo of the outer housing of the stem nut clock after I bored out the pre-existing center hole; it is sized to create a big enough lip that the screw will drop into the bore, and the depth is sufficient for enough threads of the small screw will secure the housing to the captive nut in the swivel head; the screw was salvaged from an old electronic device collecting dust in my basement:
THis is a photo of the clock housing affixed to the nav pod swivel head:
This is a photo of it mounted above the OEM gauges:
The diameter of the clock face is slightly smaller than that of the nav pod; consequently, it can be positioned in such a way that I do not have to tilt my head or duck down to see the entire clock face. The nav pod is in a better location for my old eyes to be able to quickly gather the information it is presenting to me. It is no more inconvenient than checking one's rearview mirrors.
Part of the problem I've had with the nav pod display is that when I'm driving through dense shade, pointing directly into the sun, or with it positioned up under the Reck windscreen, I have difficulty distinguishing some of the numbers (e.g., is it saying next turn in 5 miles or 6 miles? Is that a 0 or an 8? Part of this issue is related to the way the unit displays numbers, but most of it has to do with the small size of the numbers, super-low or super-high contrast lighting, and the ability of my old eyes to rapidly adjust and focus on said small numbers in said lighting conditions. It's not a huge problem, probably only an issue <10% of my typical ride, but it's enough of one that I've noticed it. This location will be better on this particular bike.