Pharyngealisation of vowels after pharyngeal segments, which are subsequently lost. (I consider this to be one change, since the pharyngeal quality is essentially "moving into" the vowel.)

[cý áˁ áˁ pʲí]

(Also, keep in mind that pharyngealised vowels are pronounced more backed than their unpharyngealised counterparts, though I will continue to represent them with [a] instead of [a̠] or [ɑ].)

Breaking of high vowels:

[ cjú áˁ áˁ pjé̝ ]

Grimm's Law, or something to that effect:

[çjú áˁ áˁ ɸjé̝]

Glottal stop protesis.

[çjú ʔáˁ ʔáˁ ɸjé̝]

Voiceless segments become voiced intervocalically:
[çjú ʔáˁ ʔáˁ βjé̝]

Labial consonants palatalize to labialized palatals of the same manner.
[çjú ʔáˁ ʔáˁ ʝʷé̝]

Fortition of fricatives.
[cjú ʔáˤ ʔáˤ ɟʷé]

Didn't we just do that?

Fronting of [u] to [y]:
[cjý ʔáˤ ʔáˤ ɟʷé̝]

Loss of initial glottal stop > falling tone on subsequent vowel.

[cjú â ˤ â ˤ ɟʷé̝]

[cjú â ˤ â ˤ ɟǿ̝]

[we] to [ø]