Have a Humble key for two games (Hello Neighbor) but giveaways only allow for one at a time?

when you redeem it from the choice page where you choose your picks from the month, it will give you one key.. easy to assume it's for both games. though if you go to your keys page, there are actually two keys they give you - one for each game.

View attached image.

So I have the option of listing it as only one of the games which decreases its giveaway value by at least half of what it actually is. I'm going to give it away regardless but I was wondering if there's a workaround for this issue?

FAQ

What are "No Value", "Reduced Value", and "Full Value" giveaways? How do they affect my overall contributor value?
When creating a giveaway and selecting a game, you'll notice "No Value" games are marked with a double asterisk (*), and "Reduced Value" games with a single asterisk (). If you hover over those icons, you'll see the effective date for the value adjustments. For example, if a game is marked with a single asterisk (*), and hovering the icon shows "Reduced value since January 4, 2018", this would mean giveaways created for that game on January 4, 2018 or later will receive reduced contributor value. Games typically receive no value or reduced value when they're featured in bundles, heavily discounted, or available for free in online promotions. Their values are adjusted this way to better represent their true value. Keep in mind, the asterisk icons are just for reference, and the value of a game can be backdated if we need to make retroactive changes.
Games fall into one of the below three categories.

No Value:
No contributor value when given away after the effective date.

Reduced Value
15% contributor value when given away after the effective date.

Full Value
100% contributor value when given away.

If you visit your profile, you can see a breakdown of your previous giveaways. If you hover over the "Gifts Sent" number on your profile, you'll see the number of gifts you have given away in each category.

For example, you give away three games. Game A is $10.00 and it has no value. Game B is $20.00, and it has reduced value. Game C is $50.00 on Steam, and it has full value. Once your giveaways have ended and the gifts have been received by their winners, you will see the updated values on your profile. In this case, you would see "Gifts Sent: 3 ($80.00)". This would show that you have successfully given away 3 gifts, and their current list price on Steam is $80.00 in total. If you hover over the number of gifts, you would see you have one "No Value" gift, one "Reduced Value", and one "Full Value". If you hover over the dollar value, you would see you have a contributor value of $53. It would be calculated as 0% of the gift with no value (0 x $10.00 = $0.00) + 15% of the gift with reduced value (0.15 x $20.00 = $3.00) + 100% of the gift with full value ($50.00).

Those that are not on the GA creation list can be requested to be added from the support ticket.
Support > New ticket >Category > Add game to list

P.S. I have already redeemed the gift link. I do not know if clicking 'redeem key' on Humble provides two keys or not fwiw.

It seems to be the key that depends on where you live.
If the game in question has no regional restrictions on SteamDB etc., it may be okay.
If you don't have the game, you may be able to use it for others, but I don't know.

If anyone is wondering how I was so dumb I didn't realize this, when you go to redeem a game with multiple keys on the "My Subscription" page of Humble Choice, it only gives you one gift link so I had assumed that there was only one gift link period. Nope, go to your keys page as andreeeeeww said. Cheers!

To answer your original question, the only way to handle this issue is to open a support ticket requesting the specific giveaway combo to be added to the list of eligible selections on SteamGifts - otherwise you're pretty much limited to what's there already and yes, that would mean that you would likely lose out on part of the CV.