Yes, I figured that, but my point stands. They need to say no. The company is requiring the type change, that isn't an individual changing types. As far as the T's and C's are concerned, it's really type for type. It would be simply unrealistic to expect extra money for flying a 737v's an A320. I don't think that's the beef tho. The type costs are, as you said. I disagree with the requirement, and I think the company will cave, if there is enough resistance. However, it isn't me, and I've been wrong before.
What does their EBA say about redundancy? The only reason the E jet guys are getting a payrise is because the larger type they are going onto pays more.