I’ve ordered a imx415 module (CS mount) with CS lens - a professional lenses (actually a 130° - there was not much options but i think there was one with 170°). It is not cheap.
I did not want a fish eye lenses, but that is what was available to place an order and see it it works.
If i can make it work i post an update here.
Until then i will be quiet (take at least 30 days).
Radxa could launch a Camera v2 with M12 mount lens, there are more options for M12 lenses on the market.
Another option is to wait for what ARDUCAM will bring ( i don’t know if they have fisheye).