Not so much an Ironclad screwup as a noob screwup.
YOU assumed that the BT could take them. That's YOUR screwup.
Next time, read the codex before buying models if you want your army to use them.
Sorry, no sympathy here (and no empathy either).
I play SM, Eldar, DH and Guard. I also have a Tau skyray, Necron Monolith, Dark Eldar raider, and ork trukk. These models were bought purely because I wanted the models, not because I 'thought' I might be able to use them in the above armies.
Hey! Where'd ... Everybody ... go?