I think I may have tried EtchDroid in the past based on screenshots, but it seems it's still not suitable for Windows:
https://f-droid.org/en/packages/eu.depau.etchdroid/
I also found this on Play store with people reporting success with Windows in the reviews. I haven't seen this one before, but it seems it requires "coins". It's possible to get those by watching ads it seems.:
https://play.google.com/store/apps/details?id=com.mixapplications.rufus&hl=en
Anyway, have you followed this Microsoft's guide to make sure you really don't have access to the recovery key on https://account.microsoft.com/devices/recoverykey as noted there?
Just in case, it would be simpler.