5:1 and stereo setup

My living, dining, and kitchen are three parts of one room. See picture.
Currently, I have the Playbar and two Play:5.

When I am watching TV the setup is Playbar plus both the 5s as back surround speakers in position A and B (see picture).
When I am listening to music, I'm mostly in the dining or kitchen area and I would like the two Play:5s to be in position B and C.
How can I create a working setup that lets me use my Sonos system for these two purposes without having to move speaker A to position C when I want to listen to music and back to position A for watching movies.
I was thinking whether I could add a single Play:1 to position A and keep the second Play:5 in position C but I'm not sure Sonos allows for that setup, i.e. have a Play:5 as right surround and a Play:1 as left surround and a fourth speaker (the second Play:5 as either mirroring the other Play:5 or 1) and then when I want to play music have all the speakers Play stereo.
I know this is a wonky problem and I'd love to hear your ideas of how to solve it best.
Thank you

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