[hojjat12000]

I know you said iMac, but if you are OK installing Linux on it, I think Endless OS* is what you're looking for:

* https://endlessos.com/home/

[prawn]

Doesn't look like it supports a Mac, but that appears to be a great option for others. My most recent Windows-based machines are unfortunately much older and tragic.

[he11ow]

This is amazing, thank you