Actually, there is an easy workaround. As long as the grid, rows, columns and elements are set and all you're adjusting is the css settings, export it to a folder in your Editor project. It will appear as a folder in the project. Copy the html files to the root and change the url for the link to the css, js, etc. to the exported folder. You can revise in RLMP and export to your heart's content without affecting your page.
Want personal and specialized help with RLM, RSD or with converting your VSD (or other) site to RLM/RSD? Email me at firstname.lastname@example.org or call 865-687-7698.