I won't try to be a wiseass and try to dictate you on what to do. Neither will I pretend that I am an expert on Provably Fair and their elements. This is your casino, and you're free to do what you want with them. But... if I may give my two cents, though:

Nonce itself, AFAIK, intended to be more as a tracker than an element in provably fairness that emphasize that both parties influence the outcome. We already have client seed [that player can utilize to contribute to the outcome of their game] and server seed [that casino can utilize to contribute to the outcome of the player's game] for that. Nonce was there to ensure each game is in sequence.

Granted, it's not exactly mandatory for nonce to be in order, but --given their intended purpose, as a tracker-- it will perhaps be more appreciated if they're in sequential order and/or at least in ascending order instead of a random untraceable sequence. And like what khaled0111 said, we already have client seed and server seed to ensure randomness [thus, fairness], so why do we need a third random element while their purpose is [more about] to help track session? Seems kinda overkill.

Perhaps a nice feature, but perhaps it's a feature that players don't welcome, or will need a huge "culture shock" to adapt.

I can understand the desire to stand different from other casino, to build and grow from what used to be nothing to something that stand amongst best, but perhaps that is not the feature to be tweaked to stand out, perhaps let the elements works like the normal PF on each and every other established casino.

Nonetheless, like I said: your casino, your call. It's just my two cents.

And oh, no, that posts and inquiries about your PF is not me being skeptic. That is me giving you room to explain elements of your site and/or to discuss things with open mind.