Rather simple little userscript that allows you to quickly switch between multiple different tag scripts without having to go to Edit Tag Script each time.
This adds a simple block below "Mode" when Apply Tag Script is enabled, this will give you a link to switch between each tag script you have set.
Tag scripts are set via the "Edit Tag Scripts" option which should appear in the block.
Tag scripts are split by ",". So for example "1girl purple_hair long_hair hat crescent, 1girl purple_hair long_hair no_hat" would give you tag script links for "1girl purple_hair long_hair hat crescent" & "1girl purple_hair long_hair no_hat".
Simply clicking on the link should instantly switch between the tag script you were using and that one.
Known issues:
After editting the tag scripts, you will need to refresh the page for them to show.
Updated