Yes, "Church/Wildwood" was done in Roadhog style - and to great effect! (Eddie - yes, the CC got their own album called "Alive at the JMB HS" - later reissued on the CD Jay mentioned).
The only release I'm aware of for the straight version was on a couple of those compilation albums Columbia used to do where they would put a lot of tracks from different artists on their rosters.
"Church/Wildwood" was one of a number of gospel songs the Statlers recorded that were never included by Columbia on a Statler album. Perhaps "Oh Happy Day" was originally envisioned as a 2 record set or perhaps a follow up was planned and partially executed, but never finished. But either way, still in Columbia's vaults are a fair number of Statler tracks (some gospel and some secular) that have never been released.
With news of the "death" of physical media seemingly being reported daily, I'm slowly resigning myself to the fact that a high quality comprehensive reissue program simply isn't going to happen. Don has said their lawyers are trying to work out licensing deals, etc. but if it hasn't happened yet, it probably isn't going to. (I'll gladly be proven wrong on this