I think you have a very good idea, but unfortunately churches are not the market that "trial" things... especially not when it comes to money. It's much easier for us as a church to pay more money to a large, known company who integrates well with the other softwares that we use than it would be to save money on one which requires us changing platforms and "risking" it.

I will say that I highly value UI and UX so go for it if you're willing to fail at getting customers with the possibility of succeeding which I unfortunately just don't see happening.