You might be on to something, Mike. One could either manually enter the link as in your example or even possibly use a Custom Text message code. If it's working correctly, I took care to process Custom Text codes before any other message codes, so other codes (such as the UID) could be used in the Custom Text code itself.
The target site would need a copy of the rem.php script, config.php and admin.php. config.php would need to be set up to access the remote MySQL server. There is the possibility that a firewall or MySQL server setting will prevent this and you would need to ask your web host for help.
Please let me know if I can be of further assistance with this work-around.
Regards