Multiple domains (special domains) for same blog

How would I go about to make wordpress (network) serve the same blog when accessing someblog.blogserviceexample.tld and blahblahblah.onion? This would be great for using Tor’s hidden service feature for security purposes (for bloggers in countries such as Norway and China where covert government torture is common).

Tor does not let you do subdomains, so I would need to make a hidden service for each politically incorrect blog and these look like af76j43jkafdja98.onion and such. af76j43jkafdja98.onion give the same access to blog/wp-admin area as someblog.blogserviceexample.tld.