Is it possible to use a plug in to set up an opt-in on the Front Page that is using the slider? I’d like to place in right up front. Any suggestions?
Not really sure if it would be easy to achieve. You might need to modify the header slider template with a child theme to do some code adjustments in there. Since it’s really complex to explain and out of the scope of support service we can offer, I am really sorry, nothing I can do. You’d probably be interested hire WordPress coder. Go to upwork.com or post a job to https://jobs.wordpress.net/.