Appreciate it, thanks!
My own design, but you can make one yourself too.
https://gitlab.hax0rbana.org/public-repos/ps2x2pico
I did not write the code but I can attest that it works for all the keyboards I've tested and most of the mice, however my mice don't have compatible scroll wheels (see the issue in the upstream GitHub issue tracker)
Discussion
If you're in the US, I'll ship you one of my prototype hats for free if you pay shipping.