numOne
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Why not announce an HWB Cup, where anyone who scores at least 1-2 points out of 7 in the OFB is eligible to participate? This would motivate players to fight for every point. Moreover, the more points someone scores in the OFB, the later they can join the cup.
You can't motivate people who drop out after a couple of lost games with additional cups and sub-cups. Instead of inventing additional incentives, you need to think carefully before signing up for a tournament – whether you can complete it, whether the format suits you, etc. Why poke around in everything possible?
Пусть мой враг будет силен и страшен. Если я поборю его, то не буду чувствовать стыда.