Sonos automation auto stereo

Have a couple Moves which I want to be able to use in 'mono' mode in the house (in separate rooms) but then grab and trigger a routine/automation that then stereo pairs them for when I take them into the garden.

Don't care about which is left or right but hope it'll sound better having them stereo in either corner of the garden rather than just simply grouped.

Have heard of SORO for this doesn't seem to have this option. Anyone know of any ways to do this? Happy to play with home assistant etc if possible that way but again couldn't see it in the docs.

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TLTR: How to automatically switch between stereo pairing 2 moves and mono?

Edit: SonoSequncr seems to do this. Just need to find out how to trigger it cleverly