Interesting, but I feel if there is a card on the board that doesn't contribute to any player's result, it's too hard to guess in just five tries. You have 2,3,4...A, which is too many options, even if you manage to get the suit correct.
I don't really know how to change the rules to compensate for this, but it feels like these 'unrelated' cards ruin the game in a way.
What you're talking about is a "random kicker" and the rules specifically say there aren't any. Every flop card hits someone's hand, in terms of rank, if not suit.
This makes it significantly easier. Got it in 3, could have gotten it in 2 except I had a 50/50 on the suit of the last card and I picked the wrong 50.
This isn’t a problem: No random kickers on the board - The rank of each board card will alway be a part of at least one player's hand in at least one phase.
I don't really know how to change the rules to compensate for this, but it feels like these 'unrelated' cards ruin the game in a way.