Out Of Stock Options

I want to use the radio button feature for my product variations however I also use a waitlist plugin which allows customers to subscribe to an email notification when a product/variation that is out of stock becomes available again. I noticed from the live demo that out of stock items are not clickable, which will negate my waitlist plugin…or will it? Is there a way to make the out of stock variations clickable so that my “notify me” button will appear? Do you have a free version of your plugin that I can test on my staging site?