You've got several options:
- Don't copy them at all. Use a Channel Changer supercontrol for the little dial. You wouldn't get 20 but you could get 16.
- Use make similar on all three controls. This would grab a unique Channel-CC, which is nice
- Put only these controls on a page and use Make Similar on the Page (double-tap on Page Properties). Same advantages as #2
Except for #1, they're all pretty manual in nature. Hopefully in the future we'll be able to provide some faster workflows.
Thanks.