From the original announcement of the "New Contributor" feature Come Take a Look at our New Contributor Indicator!
Folks will see an indicator when they go to interact with new contributors (visible for a week following their first post) letting them know that the person is new.
I think your approach is fine.
Edit descriptions don't matter all that much.
If you're the OP editing your own post, or if you have over 2k rep and can edit anyone's post, most likely nobody will even look at the edit description; you can (and many people do) just leave the default text of "added 74 characters in body" or whatever.
The only time ...