Found another good forum thread about different ways to save the SavedVars:
https://www.esoui.com/forums/showthr...=SavedVariable
Back to your question
Yes, after getting the SavedVars table of any character you can modify the contents just as modifying other table contents too.
Changing it will not be stored on the harddrive though until you do a reloadui or logout, just as normal SavedVariables as well (if you are not using the prioritized but randomized SV saving method for small data which was newly added with Murkmire to support saving of real important changes without reloadui.)