John,
I downloaded the plug-in, gave it a quick test. Did exactly what I wanted, so I purchased a license key.
Just ran it on a recent wedding to confirm that it does what I want without great complication.
First I tried it using collections, discovered that it will not transfer the ratings, flags, etc. from raw files in collections to JPG files in another collection.
Tried it using the two folders, one raw and the other JPG and it works as advertised.
Then its an easy matter to go into the JPG collection and delete the images with flags and ratings.
Same result just one extra step.
Would be nice if it worked with collections.
Thanks again for your help.