U-umlaut & schwa shifts

So here's two sound shift issues I've been thinking about recently.

*The u-umlaut seen in the development of Germanic languages is essentially
labialization (/i/ -> /y/ etc); is velarization-u-umlaut - where /i/ goes to
/i\/ or /M/ instead, etc - attested anywhere? If yes, is raising (eg. /O o/
-> /o u/) typically involved too?

*Does anyone have any creativ ideas for sound shifts starting from /@/? Mine
are epenthetic, so deletion would be pointless. Assimilation with the
following or preceding vowel comes first to my mind, but seems a little too
obvious. I can also think of raising it to /i\/, but is there any precedent
for that? Any other ideas are welcome too.

John Vertical

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