You could start your own Lithuanian yeshiva in theory almost anywhere. The way these places started was actually ad hoc and informal. And the same could be done today almost anywhere.

You you need simply a building, and a Talmud and books of Musar [medieval Ethics].

But you also would need to keep out cults. One of the reasons for the success of Litvak yeshivas was that they were based on the Gra who put a excommunication on Jewish cults. There was clearly a distinction between who is "on the bus" (with us) and who is "off the bus."

[That expression comes from the hippies who also had a concept of "who is with us" and who is not.]

And the greatest danger to the Jewish people today is Jewish cults. They are the enemy within, the saboteurs. They  undermine the foundations of the Jewish people (i.e. Torah) by keeping the external form of ritual of Torah, but in place of worship of God they place worship their leader.
They should be rigorously excluded.