Alternative hardware
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It's really hard to find the rs485 hat that you refer to in the documentation. It seems to be sold out everywhere.
Is it possible to use a different module for the modbus? Can you recommend an alternative?
I use the MAX485 USB module for RS485. It's the black USB stick with the two green screw connectors that you can find everywhere online for about 4 euro/dollar. Connect it to a regular Raspberry Pi (with USB connectors) at you're good to go.
(found out that for RPI4 the kernel was missing in the image, so I had to transplant that from a working RPi image)
I don't quite understand this comment: "found out that for RPI4 the kernel was missing in the image, so I had to transplant that from a working RPi image".
It is not clear to me whether or not I have to do something special/extra, if I want to build a system with the above mentioned hardware?
If I recall it correctly, I had to download normal raspberry 4 image from https://www.raspberrypi.com/software/ and copy some files from the boot partition to the boot partition of NebiPi in orde to get it work, but after that it works like a charm.