How can I trigger a smart rule on moving an item to the Trash?

[troejgaard]

I agree that it seems simpler to just empty the trash regularly.

However, a future release should add your desired trigger:

[Request] Make it clear in Finder that an indexed file is in the trash in DEVONthink

A future release will add an Before Trashing smart rule trigger and then a smart rule should be sufficient to perform the desired renaming.

Then you could combine that with the “Remove Reminder” smart rule script.