Should anyone happen to be interested in an update:

I presented my argument about "Shenandoah" meter at the (1st) Connecticut Sea Music Festival's academic symposium on June 10, 2022. It was streamed, the video recording of which is here (though the network lags and mic placement sometimes make parts harder to understand):

Reclaiming Shenandoah

And I "followed through" with a rendition in this "original" meter at the festival's open chantey sing, recorded here:

performance