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Could I cast disruption field on an Ironclad, then tremor, disrupting any warjack I knock down? because disruption triggers on a hit and to be tremored the attack roll must exceed the defense of the models.

While the roll for Tremor is a MAT versus DEF, note that it doesn't say that anything is actually hit. It states that models who's DEF you exceed are Knocked Down, but note it is not via making an actual attack, but instead by taking an action that rolls your MAT. At no point does it say models are hit in it.

It's a bit weird, but an example with the WM/H rules where you need to read things specifically, as in this case it is using the Tremor rules to override the normal melee attack ones, but due to not being them, creates a different situation.

And stuff.

Damn, and it would be so awesome if it worked

Find a model with thresher, then it might work.
From memory, i do not believe any Cygnar jacks have thresher.

An option could be jack marshalling a Mangler with a Merc Jack Marshal like Dirty Meg, if the spell can be cast on a non faction WJ.

Still wouldn't work. He's wanting to combine the knockdown from Tremor with the Disruption effect for an Mk1 knockdown effect.