House Dayne SI

I'm in the early stages of planning a House Dayne Self Insert story and I'd like to hear your thoughts on whether I should make it an OC self-insert or an Edric Dayne SI. If I go with an OC he will be in age with Jon and Robb at the time the WOTFK picks up and will be more of a factor from the start, but Edric is an underused character with plenty of potential that can easily captivate more readers than a simple OC. Another possibility is simply making Edric older from the start but it would take away a bit of canon adherence from the story.