RPi is easy…if you can manage an ikea build its not too difficult and takes much less space
I love my displays using RPi and Ropieee (I have 3 of them) and connect 2 with DAC’s displaying whats playing on the DAC and the 3rd uses an IQAudIO DigiAMP+ HAT with a pair of bookshelf speakers attached in the bedroom…WAF friendly too - she uses it all the time.
ROCK does not support extensions like the Web Controller that is linked. But I have put together a step by step installation guide that installs Diet Pi on a Raspberry Pi. This allows you to run the Pi as a Roon endpoint like ROCK, but also allows you to install extensions like the Web Controller and the popular Alarm Clock extension.