How do I change Outlook account of forwarded mail when Word is editor?

[Matt Fletcher]

I want my addin to change the e-mail account of a message being forwarded,
so that the message goes via the default account (the message was received
under a subsidiary account).

I've managed to do this with the standard Outlook editor by trapping the
click event on the Send button and executing the top button in the Accounts
drop down, before allowing the send to progress.

My question is: how can I do this when Word is the editor, given that the
Envelope toolbar is hidden?

thanks for any suggestions
Matt Fletcher