It could be an XMarker, but probably best not to make it a barrel as that would land the player in the barrel. Not to mention I'm not even sure you can use barrels and such as ObjectReferences (although don't quote me on this one).

I'm already tried to use XMarkers in Interiors. Loading screen appears ...and nothing happened - a player don't changes his location.
Only destination what seems to be working - Heading (or way) marker. But, maybe, it's important, is location in interior or not?
Let I explain what I want to make: the message box with several buttons, each of them teleports a Player to fixed point in the world.
Also, I do not want to make a custom teleport points (for more compatibility).
My first try was an action on the simple plate )))

I've been able to teleport to an interior xmarker without any problems. Maybe try your mod on a new character, or an older savegame?

Ok, I should try to start all from the beginning again. When the result will be - I'll write here.
Thanks for help.