Nice to see all these church goers on the board! I play with my church’s prays team. We consist of two guitarists, a pianist, an organist, a drumber, and three vocalists. Seems like I play in E, D, and C a lot. There’s a couple of songs that I play in G on one of my high d’s, usually my Silkstone.
You might want to consider a B whistle for this. It turns out to be one of the whistles that gets used most frequently by me in church.
Feadoggie
OK, I think this link might work, to a 360 degree panorama photo of the service I played for. If you do a closeup, I can just be seen to the right of the conductor, playing a bent-neck Susato low C whistle.
The best thing about playing in churches… the accoustics. (well, usually anyway) 
I do love the acoustics in a sanctuary. I occasionally sneak in there alone and play when no one’s around. On Sundays I’m a little too self-conscious.
Our organ has a midi that enables the organist the dial up or down in half step increments - the singers love that. I usually bring a D, Low D, Bflat, c, e flat, e. F comes up a lot, but I usually use my b flat for that. Need to replace my low G at some point. We have an organ and acoutic guitar, whistle (me - when I can get out of the pulpit or from behind the altar) and occasionally a string bass and drums and even a harmonica).
pastorkeith