I may have erred.

doesn't your email client combine them?

like gmail does...

You should be able to retrieve the keys from the gift link. Members have reported their accounts suspended by Humble as they suspected them being traders so it would be in your best interest to make giveaways using keys instead of easy to track gift links.

You might want to avoid using giftlinks though. Your account might be banned by hb later.

Thank you all for your input. I suppose I will make these giveaways when Support gets back from their prolonged vacation and adds them to the Game List.

Cheers to Support for such awesome action. :)
2 of 3 are now up. I could not get a key for one of them because it is a pre-purchase. "When it is ready," they say.