No I don't believe so Gert.
The second ridge is as close to the TDC ridge as it can reasonably be within the geometry of the flywheel and pickup.
I believe the ignition uses this double pulse as a reference for TDC-H, from where it can compute the rpm, advance and TDC-V updating each rev.
I have looked at the ignition reluctor pulse train on an oscilloscope and the relationship of the pulses does not change with rpm in degrees.

There is a double pickup ignition which was used on silimar age 900SS', and I believe this can be transplanted to the 906 by replacing the flywheel and the reluctor pickup mounting plate. This places two pickups in the flywheel housing spaced by 90 degrees - one for TDC-Vert, one for -TDC-Horiz. However there are also two ignition boxes, one for each cyl and they function independently. Again they fire a spark on both the compression and exhaust strokes as they can not know which is which.

Dave