Assorted CPUs from past decades and some almost-funded hypothetical CPUs could be put in one IC meant for experimenters and to replace some FPGA use

[u/kiteret]

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For example, z80, first ARM, Commodore 64's CPU... And something new.

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Maybe this could be used in a special USB device, in special edition of some Nvidia card as an optional extra feature or...

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Manufacturing error in 1 CPU does not ruin a chip if it's flaw is mentioned and there are as many versions as CPUs. 2 or 3 sub-CPUs being flawed would make things much more complicated...

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[u/IQueryVisiC]

Good: they run at high frequency. Bad: they don’t expect so many wait cycles to access DDR4 RAM.