Https on main site, http on subdomains

Hello there,

I would like to force SSL only on my main site instapress.dk, and http on subdomains.

The issue i am having is, that my SSL don't cover wildcard subdomains. So whenever a person signs up for a site at instapress.dk/tilmelding, they get a https URL, and when they try connect they get a security alert saying the site is unsecure.

So, is it possible to only use https for my main site, and http for all subdomains, front end and backend.

(I tried to force http from domain mapping, and then force https on main site from wp-confiq.php, but that resolved in a issue with DIVI theme i am using.)

Thank you for many awesome plugins btw