It does appear you can use N5C TT main shaft (610-410)
You will need:
320-411 Jesus Bolt Collar (at bottom bearing block)
100-320A Jesus Bolt
108-106 10x19x6 Radial Bearing (for lower bearing block)
Head parts:
305-206 Washout Arms
305-207 Ball Link Adapters
108-383 Radial Bearing for washout arms (4 packages of 2 needed)
106-301 M3 Shims (1 package)
100-272 M2.5x12 set screws (1 package)
100-323 M3x23 Socket Head Bolts (1 Package)
100-316 M3x15 Socket Head Bolts (1 package)
109-352 Brass Spacers ( 2 packages)
305-210 Head Block
305-204 Head Axle Pivot
You should be able to reuse the existing Blade Grips and pitch arms. If you choose to replace these also then I would definitely buy the whole head unit instead.
The N5C Torque Tube Manual is of course your reference for the mod...
Cheers,
Alan