Thanks haifai and Jez - some good, pragmatic thinking here; feel a bit dumb that it didn't occur to me that strapping an alternative fig 8 to an existing MS shotgun is an option 😂
I have access to a RSM 191, so will take the opportunity to play around with that and also rent one or two options to inform myself of what's possible, as haifai suggests. Thanks for the tip on trying a sub cardioid, Jez - again, I'd just assumed a vanilla Mk4 capsule was 'the thing' for the mid signal.
Really glad to have found the forum!