I would prefer a direct connection to the eBus, the protocol allows long distances.
WiFi is nice, but you add a latency to the connection that could make it hard to send telegrams. For read-only this is not relevant.
I would connect a ESP8266 module (like NodeMCU) with a TTL eBus converter and then put all in a nice enclure. I would use a standard pcb screw connector and a Micro USB connector for power if you use a NodeMCU.