Can I retrieve SWTOR account display name from character name?

I am facing problems returning to SWTOR because I have had a handful of accounts and characters in the past. This is aggravated by the fact that I do not remember my account display name with certainty (I believe it may be 'noblejohan') but what's worse is that I cannot remember the email associated to that account. I can however remember the character I created, it was a Republic trooper named 'Anvil Colt'. On this character (and by extension account) I have made a short-term subscription and also made several ad-hoc purchases in the Cartel Market, amounting to about 5 armor sets, 2 weapons and 2 speeders. I also remember I have subscribed because I had access to two crew skills, instead of one for just free-to-play players.

I would really like to gain access to that account again (and pay more subscriptions) but can only guess my account name (i.e. 'noblejohan') but cannot remember/access the email associated to that account. Could there be a way to use these information to track my account display name, and subsequently the email address associated with that account? Maybe I could even provide my billing information for them to track my purchase history?

I have sent an email to [edit: email address removed] but after seeing Swtorista's help thread (https://swtorista.com/articles/swtor-cant-log-in-guide/) on getting EA support, it is mentioned that they will not respond to account-management-related issues via email ... which is why I have resorted to posting an issue here instead.

Any and all help appreciated please and thank you. Stay safe everyone.