Yes but did you not say you have 2 licenses already? Yes one license per domain does not matter if you intent to use the same database or not.
Now no hacking involved. You would install one copy the normal way except one thing. The other one would be a clone except both installs would have the data and upload paths to one of the installs. Otherwise the URL paths would all be like this
instead of http://www.domain.com/reviewpost