Glueing them in with epoxy will do the job. I solved the same issues on unprecise mounts (drifted drillers in soft wood core and too big drill) successfully that way.
But heli-coiling is the cleaner way making re-mounting the skis possible. Putting some inserts in would make a gain out of a fail.
Just cross-checked jondrums template with mine.
The foremost two (standard) screws measured 40.946mm wide and 40.926mm distance to the second row of screws. I got 42mm for both values and used my template a couple of times successfully. Which doesn't mean it's point on exact, of course
The second (heel-wards) row of screws is the same, as is the first row of the heel unit.
For the second row I got the same distance to the first, but I measured a spread of 30mm while jondrums template gives 28.962mm.
Again, I can't say which values are right. Mine just worked out -but so did jondrums...
I additionally measured mid-sole position to be 5mm more back of the toe unit and distance between toe and heel unit to be 5mm less. The second is tricky to figure out given the heel unit design of the FKS.
I at first had calculated the heel unit more distant to the front unit but after a few test mounts shifted that to end up in the middle of the rather small adjustment range of the FKS.