rather than working on adding support for mods that alter menu's make it so you can use ingame commands to directly change the scale to a desired value

Command example: /tts 50 (to set it to 50% scale)

Tip the scales doesn't let you change the scale to any arbitrary scale, it only adds a slider instead of a button, so I don't see much use of a command.

If a mod changes the ui to remove the scale options, I would consider that a bug with whatever mod does that.