Ideas and suggestions.

What's the spoiler? How does it ruin the game? Does it give someone a significant advantage? There's a tavern that provides no less valuable information.

OH radically changes the game; it's no longer Heroes, but something closer to Dota or Counter-Strike. So, adjustments are necessary, even if it involves spoilers; it's still better than dealing with crashes.
I also want to suggest that in the tournament regulations, OH should be removed if at least one of the players is against it.