A few writing issues: Vestige's Grace needs to say "when bound to a vestige," and Domain Vestige says you can use two at 2nd level, instead of 7th as it is on the table.
That was more an issue with the flavor text than the mechanics, hopefully fixed.

Also, it seems to me that their lay-on-hands shouldn't be restricted to positive energy. Evil binders should put out negative energy with it.
Good idea.