I found myself suddenly thinking about Pre-Proto-Lukpanic, the ancestor of Lukpanic, and those "few small isolate languages scattered across the northwestern part of the continent." If anybody's interested in developing these, I encourage them! Anyway, here's the quick 'n' dirty phonology and SCs that I coughed up in half an hour:
p t k kʷ ʔ ʔʷ
pʼ tʼ kʼ kʷʼ
m n ŋ ŋʷ
w s ɬ ɮ x xʷ h
a i u ə
ə is never stressed. Stress rules otherwise the same as Proto-Lukpanic. No vowel hiatus (/ʔ/ is used to break it up); words don't begin with a vowel. No consonant clusters, but all consonants can occur in any position, including finally.
SOUND CHANGES TO PROTO-LUKPANIC (not necessarily in this order)
ə > /i/ medially after a stop.
remaining ə > 0.
x, h > 0 except initially; where both > h.
xʷ > f.
Initial /ʔ/ > 0.
ʔ > /k/ before /a i/.
ʔ > /p/ before /u/.
(the above rules apply when /ʔ/ follows a stressed vowel or is used to signal a morphological break. otherwise, it is lost between vowels, occasionally kept irregularly, and treated as above.)
ʔʷ > /p/.
ejectives > voiced stops.
labiovelars > labial-velars.
VCC > VəC, so *kasən
final stops neutralize to /p/ (if unvoiced), /b/ (voiced).
/ɮ/ > /l/.
/ɬ/ > /s/; except finally, where > /l/.
w > β.
f > h.
final /n ŋʷ ŋ/ > /l m 0/.
final /h/ > 0.
final /β/ > /b/.
/i u/ > [e o] / _a.
This language was on the isolating side and it formed plurals by partial reduplication. The speakers are hunter-gatherers and may have a Pacific Northwest- or Ainu-like culture. They worship many gods, chief among them *Pahiŋ
, goddess of the earth (In Lukpanic, this is Pai
, a rather secondary character, superseded by Poalu etc.).
The language was not spoken in Lukpania, but far to the north, maybe on the coast. When the Lukpanab migrated south they found the land inhabited by the Tulameya
, whose languages influenced their own, changing the look and feel of it dramatically.
I don't actually want to call it "Pre-Proto-Lukpanic." If you develop it (or a daughter) you can call it whatever you want.