Is there any way to change the PROM's idea of language without resetting
NVRAM?

It appears that my PROM has been configured for a non-english keyboard.
IE w and z are swapped, all the number keys generate characters with
umlauts and accents, and none of the punctuation characters match their
keycaps.  This is only a problem with the PROM -- once inside NetBSD
everything works as expected.

-- 
  Aaron J. Grier | "Not your ordinary poofy goof." | agrier@poofygoof.com
  "Time Correct function allows automatically correcting slight variation
   of your key touching manner."  --  Roland MSQ-700 manual