Is there any difference between the debian morph and kicksecure from the iso aside from the process of installing?
I could try that if it is going to take a while to fix.
Or you could go with the default en-US keyboard layout and change the keyboard layout after installation as per:
The differences between UK and US keyboard do not seem to be gigantic. Just perform a web search, see the differences and keep that in mind when typing any passwords (avoid the very few different special symbols).