When I was head of audio at Times Square Church in NYC (1990's) I demoed the Schoeps wide-cardioids on our choir and I didn't even have to pitch them to the Pastor, who clearly heard the improvement in his wedge. So we bought 8 of them and, as far as I know, they are still in use there.
If you can afford them I would get them. If not, Earthworks has several models (as you are probably aware) that work very well with chorus and choir, including the Flex and Flex Wand series. But (also as you know) they do not make a wide cardioid.
All other issues being considered, or addressed, I don't think that 'wide cardioid' means more feedback susceptibility. At least not in my experience.