Move subject tag to the end of the subject

Is it possible to reposition the subject tag at the end of the email subject? We have an ongoing issue of users deleting the subject tag, and thus new tickets are created all the time. Moving the tag at the end may prevent users from deleting it.

We are using RT 5.0.0

You might check out this extension, RT::Extension::TrailingSubjectTag - Switch RT's ticket ID tag to the end of email Subjects -
We looked at it but never installed it.