Quite a few boards will work fine with a modded BIOS. You do still need to short a couple of CPU pins to reflect the change made on Coffee Lake. Some of the high-end Z170 boards have better power delivery than the mainstream Z370 boards.Isn't there one of the Z170 boards that has a modded bios to take an 8700K and it works just fine?
BIOS tools have revealed that Z370 boards already have a setting for 8-cores.
http://tech-toniks.blogspot.com/2018/06/rumor-z370-and-h310-support-up-to-8.html?m=1
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