It looks to me as if you've solved your own problem - just follow your steps 1-4, and for step 5 update the RewriteBase in .htaccess. For updating the paths in posts, I like using the Interconnect IT sterilized search-and-replace tool.

Moving a WP Multisite to a subdirectory
It is possible to animate the emission of the smoke in smoke sim? I tried to insert keyframes in the fuelAmmount propierty in the flow object but it didn't work.
Thanks.
