How about the kind of "poker" that is similar to slots? I don't know what it called though...
The game was like pull the lever, and you receive five random cards. If the player gets a pair, triple, four a kind, flush, etc., he will get x payouts, just like slot games.
Maybe this way you could attract both slots and poker enthusiast.
Creating a poker game (or sportsbook as well, kinda the similar mindset) is difficult because if you make your own one with a developer in your employee then you are trusting that person, maybe they have a backdoor, maybe they didn't do it well, you can get it edited by someone else or at least audit it but in the end if they end up with a backdoor that is not found they could scam you and your customers.
You can buy an open source one, but its the same issue, you are never 100% sure you can trust them. The only option owner can have is building one themselves, coding it themselves but then the gamblers don't know if its trustworthy. So in the end whatever you do you do not have a 100% provably fair poker in your hands, hence why its so difficult to find a decent poker game in crypto.