Delete account

I have set up two emails (by accident). The one that contains most of my data I want to keep, but it has an old work email associated with it.

I would like to delete the one that has my personal email. (I'm not worried about keeping the data for this account).

However, I would like to CHANGE the email on the work account to my personal email AFTER I delete that account. 

(Garmin will not currently allow me to change the email on my work account because it says an account with that email already exist).

Is this possible? My fear is that I may lose the data in the main account (which is my old work email).