using entr to watch a directory without any matching files

Question

I want to modify *.ica files (to launch Citrix apps) when they are downloaded (to add a transparent Key Passthrough option for remote desktop), so I settled on using entr to monitor the directory, and call then another script (which invokes sed) to update all ica files.

while true; do
  ls *.ica | entr -d  ~/Downloads/./transparentKeyPassthrough-CitrixIca.sh
done

However, this only works when there is already an .ica file in the directory. If the directory has no *.ica files when first executed, entr errors with:

entr: No regular files to match

Putting a dummy ica file suffices, in which case the new (real) ica file will be detected by entr, and then acted on.

Is there a better way to do this?

The alternative I can think of is to use entr to watch the whole directory for any changes, and if so, run ls -l *.ica and if the change resulted in a new ica file, and then in turn, run the above script.

It seems inelegant and complicated to nest entr that way, so wanted to know if there is some simple option I am missing.