As far as adding a Lightning Address in a different client - it will post the profile changes when you change it, so it will be network wide and you'll be able to get zapped no matter the client you're on
Discussion
Ok, someone just zapped this post and it went to the lightning address I set up in Damus before they removed zaps. Very cool. Looks like I can still update it in Damus even though I can’t zap.