Thanks both for your replies.
In the bathroom and kitchen I use Sonos devices and have been told, and also read on here, that a 218 and Sonos don’t mix together with Roon.
I’ve considered an MS200 and AC200. The MS200 doesn’t do MQA as I understand it and of course the AC200 doesn’t act as a Roon end point. It’s a shame because it looks like a great pre-amp. Why did they stop making it?

ROON Rock on an NUC across the systems
Sitting room: 218, DSP7200SE
Study: 218, Quad 303, Spendor BC1
Bedroom: Musical Fidelity A3CR, Chartwell LS3/5a
Various Sonos boxes in bathroom and spare rooms