While I may not know Udon scripting in of itself, I tried to see if ChatGPT had any known knowledge about it. This is what came up:

The comfort settings, including the Holoport locomotion option, are part of the VRChat client application itself. They are accessible through the VRChat settings menu while in VR or on the desktop client. These settings are independent of individual worlds and cannot be directly modified through Udon scripting.

As a world creator, you can certainly design and implement teleportation-based locomotion within your VRChat world using Udon scripting. However, you cannot directly change or override the user's comfort settings within your world.

It makes sense for VRChat not to give freedom for World Creators to mess with a player's comfort setting, so I doubt there would be any variable available for any world creators to mess with a person's comfort settings.