I feel you about the hair under the chin, good news is that no-one can actually see those hairs even if you can feel them. I would either have to dislocate my should or poke the razor through my throat to get those whisker ATG.

FWIW:

A Shick injector razor has a really compact head, and the blade is a little shorter than a DE blade. It would ideal for cleaning-up that section. A DE razor would probably work OK.

Of course, it would destroy the purity of the straight-razor shave . . . <g>

Charles