Welcome to the Forum! From your user name one presumes you may be in New Zealand? We have quite a few members there, so you're in good company.
This very topic of a tall rider on a Royal Enfield single came up over on the
ADVRider Forum some years ago at
https://advrider.com/f/threads/royal-enfield-for-a-tall-guy.860491/. One of the postings there mentioned a very interesting online ergonomic tool whereby one can easily visualize a rider (and passenger!) of a certain height and leg length on various brands and models of motorcycles, including a Royal Enfield Classic 350, which is hardly different in rider position from their 500. The tool is found at
http://cycle-ergo.com/.
Otherwise, as you'd expect, it comes down to personal preference. One rider there in that ADVRider thread who is exactly your height adores his Bullet, preferring it to a Triumph he had owned previously, while others mention worrying that they might look like "a circus bear on a tiny bicycle", while yet others suggest different handlebars or risers to suit the individual. Again, the truest test of whether YOU might be comfy on an Enfield single is to just get up on one. As for that online tool, shown below are some results. Since it doesn't resemble any particularly challenging contortions from
Cirque de Soleil, my hunch is you'd be just fine and not bring shame and disgrace down upon your family as you are mercilessly mocked in the village square nor pay for some chiropractor's new boat.
Attached below is that program's depiction of rider position for 6'4" (76 inches or approx. 193 cm) with a 34 inch inseam (about 86 cm). If you wish to use the program to help visualize Aishwarya Rai Bachchan, the Indian actress often touted as "The Most Beautiful Woman in the World" as your passenger, I understand she is 5 foot 5 inches tall. Also, if that is the case, you may want to opt for the optional "Sari Guard" as delivered standard in their home market models.