Super Excellent JOB !
I have convert DSK to CPR format for 6128+ (i don't know if work on Gx4000, but it's work on 6128+)
https://www.swisstransfer.com/d/82f6791e-f69f-46d6-8fec-cd71bc62b581
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I checked in emulator, it can work on GX4000 with memory upgrade but the issue is control configuration
After start you should press Space to enter main menu and after Esc to configure control. But in the end it is enough to have only direction keys and 2 buttons. But it requires update in the code, unfortunately.