Tejas,
There is no comparison. The mast moment system measures "bending" of the mast pole. Trying to measure this at the P/C links would be impossible due to the values you are measuring versus the mechanical play of each bearing component in the control system, e.g. P/C bearings, swashplate bearing, feather bearing, etc. The MM values tend to be a great deal smaller than any single acceptable bearing play. Now if you are curious on the flight loads only put on the links then your plan works.
Also remember the MM system is optional equipment and a lot of people don't use it.
Last, the EC135 while it has 4 blades and lineage to the 105 and 117 is not part of the group mentioned. For one, it has no rotor head and is not considered a rigid rotor system as the others. Plus the 135 has flexbeams and dampers so would be closer to an articulated rotor system.
Good luck
W1