Single domain, 2 linodes

Hi

I have had a single domain linode running for a while.

I just added another linode and want to add a subdomain to the current domain

ie:

www.mydomain.com is my current

i would like

sub.mydomain.com to point to my new linode.

I have this working, but there is a problem.

my SSL cert is only available to 1 domain, so anything on sub.mydomain.com can not be SSL.

Is there any way other than buying another ssl to make sub.mydomain.com work with ssl?

Is there maybe a way I can route certain page calls from main domain to the new linode while preserving ssl?

ie:

https://mydomain.com/subdomainpage.php

have the above page run code from the new linode instead of the main linode?