How do or don't multi-name wildcard certs work?

One day I decided to build a content farm, which you can find
at http://www.web.sp.am.  Click on a few of the links and you
will see that it consists of a very large set of similar pages
with names like <a>.<b>.<c>.web.sp.am.

On the theory that even stupid content deserves security, I'd
like to move it to https.  How do I do that?  I got a cert for
*.web.sp.am, but browsers dislike it, saying that the name
in the cert doesn't match the domain name.  I tried to get a
cert for *.*.*.web.sp.am but Let's Encrypt, or at least the
acme.sh client, says multiple wildcards aren't allowed.

Any suggestions?  (Beyond the obvious one to stop wasting my time?)

Tnx,
John


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