I've been dreaming of getting a Gospel group together up this way for decades - or at least an old-fashioned "Glee Club" such as were popular in the mid to late 19th Century.
Most of the music from the late 1700's through the early 20th Century seems to have been written in four-part harmony, and singing was a much more popular and common pastime back before the age of radios and recording media.
It's my understanding that in the 1880's, someone got the bright idea of moving the melody or "lead" line down to Baritone instead of tenor, and thus was born the "Barbershop" genre'. It would not be a great stretch, I suppose, for someone familiar with Barbershopping to "retro-arrange" a piece back to the way it would have been sung prior to that innovation, and reflect with greater authenticity many of the gospel greats from the early Victorian age. Of course the later Fannie Crosby pieces & contemorary Gospel greats such as Bill Gaither could be effectivbely arranged and performed in a great number of ways.
I would love to see a Barbershop group specialize in Gospel / Spiritual / Praise & Worship music, and would be rather surprised if there is not one already out there somewhere.

May Blessings abundantly attend your quest, Bro. Tony!