An ASCIIfied (well, Latin-1-ified) orthography:
/p b ⁿb β m/ ⟨p b mb v m⟩
/t d ⁿd ð n/ ⟨t d nd z n⟩
/c ɟ ⁿɟ ʝ ɲ/ ⟨c j nj y ñ⟩
/k g ⁿg ɣ ŋ/ ⟨k q nq w g⟩
/θ s ʔ h l r/ ⟨ç s x h l r⟩
/a e ɤ o i u/ ⟨a e õ o i u⟩
/ã ẽ ɤ̃ õ/ ⟨ã ẽ ũ õ⟩
Mar e bdad içu ndmñu vtuw smag ku möz. Do wod kçyub e dow e böw vsye kör wzam mey e yex xhör. Rãv wzam smwun an hrmröy, a nquz e yman an köm. Yman yör an hör gleg kãtug, e wom xwãz zam lõ an smwun duw.
Though in practise
my keyboard actually makes it easiest to type your original orthography.
But, in fact, my favourite orthography is probably this:
/p b ⁿb β m/ ⟨p b mb w m⟩
/t d ⁿd ð n/ ⟨t d nd ð n⟩
/c ɟ ⁿɟ ʝ ɲ/ ⟨c j nj y ñ⟩
/k g ⁿg ɣ ŋ/ ⟨k g ng ɣ ŋ⟩
/θ s ʔ h l r/ ⟨ç s ɂ h l r⟩
/a e ɤ o i u/ ⟨a e õ o i u⟩
/ã ẽ ɤ̃ õ/ ⟨ą ę ǫ̃ ǫ⟩
Mar e bdad içu ndmñu wtuɣ sm ku mõð. Do ɣod e bõɣ wsye kõr ɣðam mey e yeɂ ɂhor. Rąw ɣðam smɣun an hrmrõy, a nguð e yman an kõm. Yman yõr an hõr ŋleŋ kątuŋ, e ɣom ɂɣąð ðam lǫ an smɣun duɣ.
