Grouped Product Stock

I’m working on a site that is made up entirely of grouped products, it works perfectly until all linked items go out of stock….and the ‘grouped’ or ‘parent’ product still shows but with no out of stock message.
I have tried your plugin on one product but regardless of Woo settings it seems to do the opposite and remove the parent from showing when all linked products are out of stock.
My client would like it shown but with a ‘sign up’ to get informed when restocked.
I understand that the parent product itself isn’t whats going in/out of stock…but is there a away to make it appear that way with your plugin? and add just one sign up so that if any of the linked products come back in to stock the customer gets notified?
Sorry for the long ramble.