If I understand correctly, you want Keychat to support importing nsec, which would increase the complexity of Keychat. We will consider this issue once Keychat reaches a stable version. We recommend not using the same ID for Damus and Keychat. 

 You must consider the cost of forcing new identities on potential users, identities that are an anti feature to most current nostr users 

 I think almost everyone is okay with that.