No, hackamores are not legal for use in hunter showing.
In the discipline of hunter showing, the use of a hackamore is explicitly prohibited by the rules governing approved tack. The traditions and judging standards within hunter divisions place a strong emphasis on a horse performing in a traditional bit, demonstrating willing and subtle responsiveness. This preference for bitted bridles extends beyond competition; even in educational environments like hunter/jumper clinics, particularly those preparing for events such as a derby, it is generally expected that a horse will be ridden in a bit.
