Your problem is that you need 4 wires plus ground from the feed switch up to the fixture: Hot (to feed the companion switch), neutral, load, and control (back from the companion switch).
I would use a transmitter switch at the companion location. That way you don't need the control line and don't have to pull a new wire. Run Hot, Neutral, and Load up to the fixture with hot and neutral feeding through to the companion location to power the transmitter switch.
So you are saying run a separate line from the panel to the fixture (or companion location) to provide neutral and use the three conductors between the switch and the fixture for hot, load and control? Yes, That would work.
I THINK........ that if you run a seperate neutral you have to be careful that the impedance of the line is no longer balanced. If you had something sensitive to that such as a GFCI it might nuisance trip (like if you share a neutral between to hots which is common..
If its only a light then there should be no problem.