VG8020 keyboard to PS/2 port. Schematics available?

I've also been looking for a long time for a scheme to build a VG8020 TO USB interface (the Ps2 connection can be done with an adapter).
Several interfaces have been made with the C64 and they work great.
I think it's useful, many have non-working VG8020s and maybe no longer have CRT monitors (like me).
The use of a simple interface would allow to revive these machines

The keyboards are just key matrixes connected to the PPI. If the PPI is emulated in FPGA, then theoretically you could connect the matrix directly to the FPGA (if it has enough free pins left). KDL or someone else with enough knowledge might be able to adapt the firmware for it.
This would actually be really cool and be perfect emulation

Another option would be to connect the matrix to some adruino type of device... or an actual PS/2 keyboard controller.
Then all you need to do is create the right key conversion map for the fpga.

I see a USB interface much more useful, I don't know about you but here in Europe the PS2 interface has practically disappeared and then eventually you can use an adapter.

Think of the ease of use: Do I have an FPGA like the Mister? No problem the USB port is available. Do I have a Raspberry? No problem, the door is available here too.

Example (C64 with cheap Arduino Micro)