The original one was KMAP and it was renamed to KMAZ when the compression was implemented. Now you have removed the compression, but not the magic key. I do not know if it is still the same as the original implementation (Minix 386vm). May be KMA330 would be a suitable magic key.
You removed the compression of keymap binary files. The format of the binary file has been changed, but not the magic identifier: https://github.com/Stichting-MINIX-Research-Foundation/minix/blob/4db99f4012570a577414fe2a43697b2f239b699e/minix/include/minix/keymap.h#L167
The original one was
KMAPand it was renamed toKMAZwhen the compression was implemented. Now you have removed the compression, but not the magic key. I do not know if it is still the same as the original implementation (Minix 386vm). May beKMA330would be a suitable magic key.