Poor SS...they can't win for losing sometimes.
They want to offer a key character that, while important to the collection (he is Indy's ROTA nemesis after all) is still a character that's basically just a guy in a suit.
They probably had the same thoughts when it came to offering Palpatine,,,how can we jazz up this release which is basically just an old guy in a red dress? Viola! Two-pack him with his bad-ass alter ego! Great solution, everybody loved it.
With Belloq, they could have gone with a 2 pack (white suit/ceremonial robes) but instead go for something that will end up adding great display value to the Indy ROTA collection...the idol stand environment.
I think it's pretty inspired, actually. I love the idea the Sideshow is actually thinking outside the box to offer some variety in this collection.