When my wife and I pastored a small neighborhood church in Memphis, I was the band. Once and awhile we'd have a visitor who played piano or flattop.
I pawnshop a small PA system, one piece at a time. I had a 66 key keyboard with presets. I worked up about thirty cover and original songs on it. Then I lead some songs with my flattop.
The most important thing is not what goes into the music but what comes out of it.
Having said that, I learned that a lot of folks are lead not by the spirit but by the music in church. And that's ok. Church is not just about christians but all people. And our church was in a wild part of town.
I commend you for what you are doing.
Here is Cordell Jackson at our church. That night we had a guest gospel band visiting. You can see our PA speakers on the poles.