Currently Being ModeratedOct 8, 2013 1:44 PM (in response to Gordon Henderson)
This is an update. I have solved this one. I found a guide on ThinkDifferent which was a somewhat more detailed version of something I had seen in MacWorld.
After (finally) learning how to attach a folder action to the invisible .Trash folder, I have a workflow that copies items from the trash to a a backup folder which is backed up by Time Machine.
It does not discriminate between old iOS apps and real trash, but real trash can be jettisoned by temporarily switching off Folder Actions using Folder Action Setup, moving items to Trash, and emptying it.