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Let's say, if we reduce the speed of the upgraded harpies by 1, then the workshops won't be captured without Lore.
If this is true, then that's how it should be done.
Besides the workshops, this will also slightly reduce the Dungeon's overall power. But the Dungeon is strong enough that this won't significantly affect it.
P.S. I haven't studied this workshop issue myself yet; I'm playing as the Stronghold in "The Succession Wars," so I'm starting with "let's assume."
P.P.S. As part of the tournament, we can simply state that players must use harpies with a speed reduced by 1 in the workshops – yes, it's a hassle, but it's also an exceptional situation.
P.P.P.S. We should also think about nerfing the Conflux in "In the Wake of Gods").