One day, a friendly wolf said:
so all you need is a usb stick with a windows 10 installer, boot to that, click “Repair my pc” after it asks you for the language -> open the troubleshooter -> open the command line interface
then switch to the C drive
then cd Windows\System32\
rename osk.exe osk.old|
rename cmd.exe osk.exe
close and boot windows normally
click the On-Screen-Keyboard which now opens cmd.exe
net user “username” *
type new password
make sure undo your rename of the cmd.exe and osk.exe things after you’re done