For what it's worth, when the original Rosetta (PowerPC to Intel) was released, it wasn't faster to run emulated/translated PowerPC apps on the first generation Intel Mac, but a few Intel Mac generations later, it was. There was a reason why Apple decided to migrate off of PowerPC. :-)

See also this post about Rosetta performance from someone who ported Google Earth: https://news.ycombinator.com/item?id=23686924

For Linux and Docker, you might want to check out:

Transparently running binaries from any architecture in Linux with QEMU and binfmt_misc

https://ownyourbits.com/2018/06/13/transparently-running-bin...

Docker Engine on Intel Linux runs Arm Containers

https://blog.hypriot.com/post/docker-intel-runs-arm-containe...

While it describes running ARM linux binaries on an Intel machine, it should be possible to do the opposite.