It's not a problem if you have another workflow that toggles the visibility of files, there are several of these.
If you want i can upload the one i'm using (cause i can't remember where I found it)
I hope I'm not asking too much, but since I have no experience in creating workflows nor scrips, there is a chances are you help me with this?
I think you should also add the nohidden command to the workflow, This is how it will be perfect toggle.