Considering that there is no straight forward solution for this problem, as until a self-signed certificate is accepted by the user, the browser locks down all requests made in the background.
The example of how it will work for the wizard page and for the other pages on which SSL certificate for the currently used domain may be changed. It’s not perfect but considering the situation, I would say it’s – good.
It will show an extra check message with a clickable link, assuming that if it happens on one of those pages, where SSL certificate may potentially change for currently used domain, with a stylish, convenient ans straight-forward to use pop-up.
Example:
