Um have you ever talked to a ski boot fitter? I can cant a footbed, notch the arch, grind the toe, manipulate whatever. It might be spelled bootwerx or bootworks my brains shot 3 long days in the sun shredding and one giant slam.
Good point, except that the alines still have tech that can't be copied by a boot fitter.
All in all, you're probably right, a complete custom solution would be the best.
Oh btw, I think this is what you were talking about?