voltage – How can I connect a Raspberry Pi to a 29V KNX bus?

I have a smart home system using KNX, and I want to expand to it using my own displays and sensors. I also want to replace some KNX devices with my own devices (which I will program myself)

The KNX bus conveniently runs through my entire house to any place I would want to connect a device, so it would be easiest to have a Raspberry Pi (or similar) run off the 29V supply voltage and directly connect to the KNX bus to read and write signals.

How would be the best way to do this? Do I get a transformer for every single device I want to connect, to step the voltage down to the 5V the Raspberry Pi runs at? Or do devices exist (similar to a Pi) that run at 29V?