EXS Aerover, Farsports F1, THE ONE PRO and its offshoots
Thanks. Of those The One Pro looks like it could work. However, I'm not a mechanic so am happy to be corrected on the others.
The complication here is the D-shaped steerer column which means that the cables have to run down outside the flat side of the D but inside the overall circumference if it was O shaped, e.g. "
". Sorry, example gets changed into an emoji but it still illustrates the point if you use the mouth as the D and eyes as the cables.
With a standard steering column the cables run outside the circumference of the column ":O" and then might come in through holes in the column or through a specialised headset. The spacers for EXS Aerover and Farsports F1 don't look like they can bring in the cables to be next to flat side of the D. They have a separate compartment for the cables to run down, so I don't think those would work.