I have a board which has a dual 0.1 inch header footprint (the totally standard kind you see everywhere). Trouble is, this carries a fast 300-500 Mbit DDR LVDS signal (!!) to another board. Okay, so not the best use of a 0.1 header there. I didn't make this but would like to reuse it since the board is cheap and readily available.
So: I'd like some way to carry high speed signals with some degree of signal integrity starting from a 0.1 inch header footprint. This isn't a request for a part recommendation, rather a question about how to approach this. For example I could use super-short pogo pins, or a shielded ribbon, or FPC cable, or maybe solder a single header strip to both boards directly (~3mm mated height, permanent), or maybe there is a high speed connector that fits this footprint. I can design the other board this would connect to however I want. Also, I don't need to cover any distance, this can be as short/direct as physically possible.
Btw: The differential pairs go to side by side pins on the header, and they are quite well length matched. So there is that at least.