Not interested into creating such an addoon either but I'm curious:
Do you have an overview which video settings in detail would be changed for a trial?
I never change anything as I noticed lowering the video settings even drops the FPS more than keep it raised
I think if you'd provide a list of settings which should be affected for the profiles, depending on a zone, this could be established more easily.
To the dev who is interested:
You can have a look at FCOMounty as a "template addon" for the zone and subzone (subzone can be stripped as a reloadui for each subzone makes no sense!) selection settings, add maybe add the raids/dungeons to the lists of each zone (instead of the subzones).
Instead of mounts to use for the zone + subzone provide the settings for video and gameplay there (accordingly to Votans Adaptive Settings maybe).