This belongs in the help section.....
It is in the help section.....
Alright, I took a stageDXShrine.rel and (with the stage switcher tool) made it a rel for battlefield.
then I took my Temple-based stage and renamed it STGBATTLEFIELD
That should mean that I've properly replaced battlefield with a temple based stage?
Yes it should work. You've done it right. Just remember that the new .rel file for Battlefield should be named st_battle.rel.