I tried to get the pack listed as an option with a support ticket but didn't get any reply for months.

I wrote up an explanation as to why Bundles can't be listed (if that would actually be helpful to post, let me know), but it does seem like this game does actually have an unlisted Package [>>] that support could theoretically manually list onto the site. So I guess they just haven't gotten back to you because, y'know. That's just how they do, these days, I guess. :/ Though Add Game To List tickets have always been just barely above User Reports in terms of being neglected (at least, since Shobo left some years back), so there's still a chance it'll be gotten to eventually.

For now, you'll probably want to have the winner leave a message confirming what content they received, as that'll let you smoothly put in a Change Giveaway ticket later on just by referencing the comment, if staff does ever add the package listing for the game.