Interesting, could you share any more details? I don't mean step by step guide, although I suppose someone would appreciate that. Just some pointers for start, like what do you use? I most likely won't be trying it myself, I'm just curious. I keep finding some software named ExaGear, but it seems dead now. Then there's even ESXi for ARM that can run on RasPi (I didn't expect that), but doesn't support running x86 code. I guess QEMU should be able to do it, but I'd expect to find more info about that than I'm finding so far, which is none (well, I'm not trying too hard, but still..).
After a lot of playing I found a nice combo. I use Void Linux for Pi and Qemu. Both super low system requirements and works like a charm. If you know Debian based basics; you'll able to config no issues. Puppy Linux and Tiny Core also worked. Puppy was bit unstable so I couldn't trust it. Tiny for some reason froze from time to time. I run Void now stable for the past week. CHR really does not require much. I've even tested with my Pi 3B and it worked well. Memory was constantly between 450-600mb usage. Haven't seen once where it used more than 800 out of the 1GB available. So my Pi4 is a little bit overkill in this scenario as I only use the CHR for The Dude Server so nothing major at all. I'll be migrating it to the Pi3 permanently as it's more than enough for the job so I can use the Pi4 elsewhere.
I've seen Exagear pop up from time to time under my security labs etc. Haven't tried it.
A guide....Mmmm that might actually be a darn good idea. Once done, I'll link it under this post.