[_ck_]

Yes, that is what my plugin attempts to do.

You would set your regular bbPress url as HTTP but the plugin will detect when you are trying to use HTTPS and modify the internal url on the fly to HTTPS without permanently changing it.

Then you just have to modify your login links to link via HTTPS to start the process.

I guess I could further modify my plugin to force a HTTPS redirect when it sees the bb-login.php page.