Inchoative and cessative

Okay, that's it. Can we please stop beating around the bush and choose these? I've had them on my to-do list since at least 2002.

Here are the available particles, excluding those with no high vowels on the grounds of this post:

hi ku li mi no pu su tu u

ua ue ui uo ie io iu

Wow -- we're really down to the bottom of the barrel. Note that u is back after 10 years or so; I've decided it's a nice enough particle that it deserves a role more important than inclusive "or," and I've moved that over to au in homage to Esperanto.

Inchoative first. Let's translate the phrase "...and then, he started to speak":

e he toa, ta X puhu

Actually, maybe it won't be that hard. I'm thinking su for cessative (sort of like a special kind of si), and mi for inchoative.

e he toa, ta mi puhu.

Likewise, we can do ni su suo ka lono "I ate up my soup," "I finished eating my soup," etc.

Let's let them stand for the moment and see how we like them.

Question: are these necessarily perfective because of their meaning? I'm thinking probably yes. Can I say ta ma mi puhu [when...] "he was starting to talk when..."? Not sure. There isn't a logical reason why not, but there might be a typological one.