I guess you've found some....
There is a Bill Gaither Song 'I am a promise....' It's on youtube. I played it for our church with our kids and they liked it. Of course we gave it a gospel groove, and took out the corny talking in the middle. It's a blues based tune so it fits real well in the gospel thing.
I did "In The Sanctuary'' with our kids...no harmony, but they caught on fast.
Donnie McKlurkin's 'Hail Jesus'.
Also did a non soloist version of 'Order My Steps' that worked well.' Well, I did spread the verses amongst my members for some solos, but I didn't have anyone doing the traditional solo.That was cool.
Another one I have done since I was a kid-Jesus, Jesus, Jesus in the morning, Jesus in the noon time' etc. Another blues based song that lends itself well to gospel music.
'Wade In the Water'-did a funky version of that that went over well. A lot of those real old school spirituals are good for kids songs, and the older folks like hearing the younger ones learning them.