Its a difficult one, no NATO I have tried have been as nice as Omegas but they are eye watering in price.
Our hosts deluxe Natos have a similar feel but are a bit thicker and stiffer, the hardware is not as good in my opinion, however they are a 10th of the price.
I have tried a Georges-straps seatbelt type and it was on par with the Tudor Natos. still not as nice as the Omega
Judging by other straps I have had from the brand I would say Zulu Divers Nato would be one to look at. https://www.zuludiver.com/collections/professional-nato