Just found a hint that I had the wrong download link for the modules.
The files within “raw” instead of “blob” work beautifully!
i.e. https://github.com/robertklep/dsm7-usb-serial-drivers/raw/main/modules/geminilake/dsm-7.2/ch341.ko
With those the modules can be inserted into the kernel without any problem.
Up and running again and happy 