Securing domain pointers with a single domain certificate
Because multi-domain certificates can be cost prohibitive or less than straight forward to order, a workaround is using domain forwarding and flexible SSL through cloudflare.com. Flexible SSL means the connection is secure between the client and cloudflare, but is not secure between cloudflare and the site. So it shouldn't, for example, be used to secure a subdirectory pointer. But is sufficient when a domain pointer is only an alternate address for a site. Please note that this will assume some familiarity with cloudflare since it is an external service.
Add the domain pointer as a website in cloudflare, select SSL to see the above screen and set SSL to Flexible.
Now create the domain forwarding rule by clicking Rules > Create Page Rule
In the If the URL matches field enter the domain pointer
For Then the settings are select "Forwarding URL" and "301 - Permanent Redirect" and enter the primary site domain in the "Enter destination URL" field
Save and Deploy