I think what I found on One FC would solve some problems:
ONE Championship’s weight classes are unlike any other martial arts organization in the world. ONE leads the global martial arts industry by banning weight-cutting by dehydration, choosing instead to implement a revolutionary system that ensures athletes are fully hydrated, fit, and healthy ahead of their bouts.
The new program, which is the first of its kind for combat sports, is focused on athlete safety by introducing “walking-weight” competition via multiple weigh-ins and tests before and during fight week, including three hours before an event begins.
An athlete’s “walking-weight” will be determined by a robust system that will track his/her weight on a regular basis throughout the period that the athlete is contracted to ONE.
The revolutionary weigh-in program was established after thorough discussions and recommendations by ONE Championship’s medical and competition team, consisting of Vice President of Medical Services Dr. Warren Wang, Chief Medical Advisor Dr. James Okamoto, Vice President Rich Franklin, and Vice President of Operations & Competition Matt Hume.