# turned/inverted (trailing I is uncommon for lowercase, and already used thusly for !I, ?I and NI)
aI ɐ
+cI ɔ # open o
# EI Ǝ # could be confusing, as it's not uppercase schwa eI
eI ə # schwa, not turned E (latter is very uncommon)
FI Ⅎ # not a letter
MI Ɯ
mI ɯ
# nI ᴎ # reversed capital N, but NI already in use
-oI ɔ # can't invert O
rI ɹ
# RI ᴚ # conflicts with RI control char
tI ʇ