Well, it's tricky. Just saying he's going to ignore the order isn't the same as ignoring it. So he wouldn't be in contempt unless/until he actually DID ignore it. So I don't think you could have him pre-emptively held in contempt.
It would possibly be grounds for an application for supervised visitation, though, if he can't be trusted to return the children in compliance with the order. Might want to look into filing a motion for that--it would get the case back in front of the judge faster, and you might be able to head it off at the pass. Just a thought--NOT legal advice.