A Telvanni can it be to Vehkships?
Participate in the project, use ...
Or that kind of thing is reserved to the Whirling School and other mystical stuff completely detached from the game Morrowind?

Is a need to roleplay, wanting to play a Telvanni of the fourth era using vehkship to travel plans.
But if telvannis are too down-to-earth for that ...

A Telvanni might join certain projects if he found it interesting enough and the others would have him.
Or he may devise his own means of travelling into space, Oblivion or Aetherius.
It would all depend where his interests lead him, a Telvanni master wizard more or less follows his own plans.