Hello Peter,
at the moment it is not possible to use a Raspberry Pi 5 inside a DGT-3000.
The only solution would be a complete reimplementation of a program called "dgtpicom" which is the program that talks to the DGT-3000 via I2C-Protocol.
The RPi5 is using a new system architecture wich the old "dgtpicom" does not support.
The problem is not that hard to solve but still requires some skills and time.
Let's see when I find the time to dig deeper into it.
Kind regards,
Roy