Remote email print to Brother MFC-L3770CDW without on-prem password requirement

Is anyone aware of any third-party solutions or workarounds to have remote ePrint working to a Brother MFC without requiring the printer's owner physical tap in a unique password for each print job on the printer's LED panel? Brother's [Cloud Secure Print](https://help.brother-usa.com/app/answers/detail/a_id/160513) isn't going to work for my client that needs her virtual assistant to send remote print jobs automatically to the printer without the client or her MacBook being present in her home office.

I was trying to transition this client from HP/Epson to Brother for better hardware/software support, but this eprint limitation is going to be a deal breaker with how their business functions. HP ePrint assigns an email address to the printer, and you can restrict specific senders to send print jobs as email attachments. The client nor her laptop need to be present for this to work.

As AppleScripts haven't been supported since Mac Outlook 2011, it doesn't look like even a Mac Outlook inbox rule could be a workaround. Anyone know of a third-party application or service that can integrate with Brother's MFC cloud apps?