Collectible Card Game Headquarters

I've noticed I can't play many of the challenges presented due to the absence of a commander in challenges where I'm forced to play another deck. Is there a workaround to this?

Also, the shop on the random commander world doesn't offer many commander preconstructed decks. I found a workaround by moving the precon commander decks to the precon folder under quests and adding shop data, but I don't know how to add custom images yet.