I am eagerly waiting to hear from OP more about this betting process and how to go about it because I know that in time to come it might likely be the new trend in the gambling industry and that might see gamblers paying high fees or whatever the case may be.
Maybe since he asked not rollbit maybe his looking for more platform. Then it means rollbit does nft feature for gambling too?
I think so because OP requested information on other platforms with such gambling features. Maybe OP could try Betfury
https://betfury.com/nft/lootboxes It just might interest OP after trying these features.