For the ICO I'd recommend an aluminum plate between the clamps as a dashboard platform, extending forward (or rearward). If that's not possible, then get longer bolts & use washers to take up the excess & fill in the countersunk holes. If all else fails, get a billet ICO mount or call ICO and ask for other solutions.
Handguard mounts. Enduro Engineering has the fat bar clamps. ~$30. I have them on both our Zooks, but would recommend the type which bolts directly to the top clamp pinch bolts (makes for more space for cables, resists rotational forces, allows fat bars to feely flex, etc.) I have a pair of plished Summers Racing Components mounts you can try so long as your top clamp (fork) pinch bolts load from the front to the back. Let me know.