Custom Chapter Epic Hero Question

Brothers, I have a query. I have been making a custom successor chapter. I'd like to run Ashan Shan and a hero that boosts plasma weapons. Customized for my chapter of course. Are there rules for running epic heroes from other chapters? Or does the crucible of champions have guidlines on making. As much as I love He'stan and Agatone. The Star Drakes rain plasma fire from the sky.

Obviously this would be for casual play and narrative play.

Thank you for your thoughts and comments in advance brothers: