SSL certificates on multisite with 70 mapped domains

I have a WordPress Multisite without about 70 mapped domains, running on a Cpanel account. Browsers will soon generate warnings for non-SSL sites so I need to be able to generate SSL certificates. But multi-domain certificates have a limit of a hundred domains, and subdomains count towards that limit inc www. But Cpanel only allows one certificate per account so what do I do?

The multisite is on Cpanel. There are over 70 domains parked on it and mapped to the multisite. My server support team has told me that I can only install one SSL certificate. We had a look at let’s encrypt but there’s still a 100 domain limit. People get around it using virtual hosts but apparently, that’s incompatible with the Cpanel setup.

Please advise the best possible workaround in this case.