Wait for it to be added to the giveaway list. Maybe you could ask for it to be added?
Give away the keys (well, humble links) individually in separate giveaways.
Make a giveaway for one of the games and in the description let everyone know you're throwing in the other games for free. You're allowed to do this.
Think that's all your options.
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+1
And I doubt it will be added until at least the bonus games are out though, since there'd be no way to verify if an above-average copy was given. (Wouldn't technically matter if only the below-average was added for now, but then you'd have people asking why they can't find the above-average version in the list.)
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Pretty much what the title says
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