Keyboard disabled during Windows 10 reset

Hello,

The title of my topic will at least be eloquent...
Since yesterday, I can't reset my PC using the Windows command (ms-settings:recovery).
Indeed, after initiating the whole process, my PC restarts, and I find myself facing a blue screen that asks me to configure my keyboard.

https://www.cjoint.com/c/IHDpE6unfql

The thing is, the keyboard doesn't respond! Not just "a keyboard that doesn't respond," but it's not even on, that's saying something... (keyboard type: USB).

I’ve gone through the forum and many others where this issue has been highlighted more than once, but no solution has appeared to me. I have tried, however, to draw inspiration from the actions taken by these other people.

What I've done: (consider that I initiated a reset procedure each time).
[No change = the keyboard does not respond].

- Tried plugging into different USB ports on the PC (I don't have 3.0 ports on my PC), in the back, in the front: NO CHANGE.
- Checked the BIOS to ensure everything was in order: the keyboard and mouse are indeed recognized in the USB ports: NO CHANGE.
- Still in the BIOS: enabled "Legacy USB support" (instead of automatic): NO CHANGE.
- Plugged my keyboard into a PS/2 port via an adapter: CHANGE NOTED --> the LED on my keyboard lights up, unlike previous restarts. But it still doesn't work: NO CHANGE.

In short, I'm stuck hard.
I created a copy of Windows on a USB stick if I understood correctly (via MediaCreationTool1903), but not knowing too much about how it works _ I fear losing Windows for good_, I initially preferred to follow the "standard" paths of Windows itself.
Originally, I planned to do a fresh install on my PC, thus deleting everything (except Windows, of course). My backups being ready, what suggestions would you have for me to achieve my goals?

Thank you in advance.