Yaskawa Servo Pack/Motor compatibility

I'm building a CNC router (hopefully also for milling aluminum; it's
got THK guides and ballscrews etc).

I have bought an SGM-02A3 Servo motor and a SGDE-02AS Servo Pack
(both 200W, both used). Now it turns out these don't work together
(the servo pack being a budget version which expects 1024 P/R from
the motors, while the motor encoder is 2048 P/R). (The # or pulses
has to be correct between motor and servo pack for the commutation to
work on these 3-ph motors.)

So, what do I do now? If the motor encoder signal had been a normal
quadrature signal I could have built a divider circuit, but the C
phase is very strange, probably something to allow the Servo Pack to
know where the rotor is without having to look for the C pulse for a
whole turn. Anyone's got the specifics on this signal for the Yaskawa
motors?

I can also buy a 400W version of the correct Servo Packs, which could
*probably* work if I lower the torque limit to 50% (but I would lose
the peak torque ability of the motors). Anyone knows if this would
work?

Or perhaps go with a different system altogether? But it has to be
cheap, not more than $450 + shipping for motors and drivers for three
axes. And the motors should be around 200W each.

Thanks,
Arvid