Default sender address when using aliases

Hello:)

I have recently started using mailbox for work, and I am happy so far!

I have generated an alias for security reasons, since work emails are public and widely distributed across platforms.
Creating an alias and changing the primary e-mail removes the possibility for hackers to make log-in attempts even if they have email address. If the log in address is something only you know, you have reduced the security risk greatly.

However, whenever I compose a new e-mail now, the default sender is the alias which is a risk when in a hurry or not paying attention - it's easy to send an email from the wrong address!

Is there a way to set a "default sender" address (the public work email), without making it the primary address (log in credentials)?

Thank you so much for your services!:)