You can't force a solution by mucking about with physical facts no matter how "spooky at a distance" or other fascinating properties they may have.

However you CAN extrapolate.

So tachyons might be an explanation of quantum entanglement which is what Einstein didn't accept. Hence his "spooky action at a distance" remark in dismissal of the theoretical (at that time) existence of the phenomena of quantum entanglement which has subsequently been proven to be true. FTL communication does occur when entangled particles are tested even over vast distances.

HOW it occurs is a completely different box of cat and the act of determining the state of said mog (dead or alive) actually changes the probability, flips the coin, so to speak. On the other hand tachyons might explain how its done.

Why were tachyons ever postulated?

In quantum field theory, a tachyon is a quantum of a field—usually a scalar field—whose squared mass is negative, and is used to describe spontaneous symmetry breaking: The existence of such a field implies the instability of the field vacuum; the field is at a local maximum rather than a local minimum of its potential energy, much like a ball at the top of a hill.

A very small impulse (which will always happen due to quantum fluctuations) will lead the field (ball) to roll down with exponentially increasing amplitudes: it will induce tachyon condensation.

Once the tachyonic field reaches the minimum of the potential, its quanta are not tachyons any more but rather have a positive mass-squared. The Higgs boson of the standard model of particle physics is an example