Downgrading an iMac beyond the earliest supported version?

There’s some software that’ll only run on El Capitan that I would very much like to use, but my 2017 iMac (i5-7400, Radeon Pro 555, 8GB RAM, Fusion Drive) shipped with Sierra. Is it possible to do some magic and have an El Cap partition alongside my main system? Any help would be massively appreciated.

submitted by /u/ThaNeedleworker
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