Question www redirect SSL warning, www not included in SSL cert

[LarsK]

Problem:
Some of our clients don't include the www subdomain in the SSL cert because of the extra cost. The problem this creates is that if users go to www.domain.com they will get a SSL warning from the browser, after that they will get redirected to domain.com.

Question:
Is there a way to use a different SSL cert for www.domain.com (like let's encrypt)?

So,
www.domain.com - let's encrypt - redirect to domain.com
domain.com - SSL cert domain.com - main website