I've Done a Lot of Stuff With a Ships Semit Mike and a Shotgun as the Centre Channel.

I don't think they are intended for field recording, but they're surprisingly good for it generally. I actually did an entire santifex library with the ships where i had the desheps cardioid with the figure eigt. And then i had a line audio c m three shooting backwards for the rear m and i did an entire hospital ambulances library with that. So, yes, mixing and matching the centre channel as definitely a thing. You can even go beyond cardioid and hypercard, like i've done multiple mess recordings with an omni as my centre channel. And i've also done stuff with the shotgun as the center channel as well.