Print KIT (or FRI/SAT/...) on badge in large letters.

[seven]

Print KIT (or AIT or FRI/SAT/...) in large letters on edge of badge.

(ideally vertical printing, white on black on the left edge of the badge).

A color coded stripe on the badge only works if everyone at the con has memorized the meaning of the colors.

[seven]

It'll save us from having to buy KIT/AIT ribbons (that someone could pull off their badge).