No. It won't be allowed in most places.
You seem like a guy who would be able to answer this.
This guy i know was telling me taking a punch from bare knuckles is much better than with leather gloves. Something about absorbing impact and or bones breaking to slow and lessen impact.
Fact or fiction?
Absolutely no chance. With what we know about athlete safety and long term damage nowadays, every major stakeholder in a position of power, has become risk-averse, and will continue to do so.
It won't get the marketing, it won't get the airtime, it won't get the sanctioning.