Could we implement a SwissSign SSL certificate with a virtual server?
If SwissSign is the CA you have to work with, there's no reason why not. We can help set that up for you if you would like. However consider if there is any advantage over cheaper certificates. If you publish the fingerprint of your private key and encourage people to use plugins like certificate patrol, http://patrol.psyced.org/ to check the cert, then a cheap cert is as good as an expensive one.