I'd assume so, but if you already have a VM running your blog normally, then you can just have nginx/apache/haproxy/varnish/whatever you use forward the traffic

I'd assume so, but if you already have a VM running your blog normally, then you can just have nginx/apache/haproxy/varnish/whatever you use forward the traffic, and once you're done point it back to the "real" blog on the same VM once your experiment is done.