I cant use a connector, there is no space and I dont feel like remaking everything to make it bigger and have to buy connectors on top of that. Every signal wire is SIDE BY SIDE, and underneath that is ground plane or a grounded jacket, thus double row. You can use this tactic since the fields will be controlled and no crosstalk will happen due to ratio of seperation vs distance from plane. Bu doing this I save space in the critical axis. I am deciding on wich 1.27 ribbon I will buy.
I was gonna use either ground plane ribbon cable or jacketed ribbon cable, for a very dense fit. The second layer of holes is to provide low impedance termination to the ground mesh or jacket depending on the ribbon cable I choose. I will provide solder points seperated by mask lenght all across those holes and connect the ground plane there, and essentialy provide another layer on the Z plane for an area that is challenging to resolve without resorting to more layers.
Then in between the holes where there is mask, I will add a bit of relief with a blade so that mesh dont go too close to pcb.
But what I realled wanted, was simple double row wire, or "compressable single layer wire", so I dont have to mess with a ground mesh or jacket. The problem now is how to actually take out the insulation of a double row, the mechanics are now all screwed up for a simple 1.27 stripper, so the grounded plane wire might be better.