Fisheye other than 180 degrees

Beginners
1

Hi!
Is there any other way to get a fisheye render, but for a 210 degree dome (instead of the 180 degree)?
I know I can render in cubemap and then use the Projection TOP to fisheye and enter the desired degrees, but when I do so, my realtime output lags a lot, so it’s not an option, since this is for a live show.
Lens Distort Top doesn’t work either.

Edit : Why is the final render of a Render TOP in cube map mode, then Projection to 180 degree fisheye, very different of a Render TOP in 180 degree fisheye?

Thank you!

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