Hi dbell,
Yep...makes sense to me Since you are unable to make changes to the seller details text on the Auctiva lister page, if you would like to use seller details text of different colors to coordinate with different templates you would like to use, I recommend creating a separate seller details profile for each color you will be using.
I hope this information proves useful. If there is anything further I can do to assist you, please don't hesitate to ask!
-Mike