New Zealand Law
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I am a New Zealand lawyer based in Wellington. Although the site is based in the United States, this part is for New Zealand law questions, and I am very familiar with New Zealand law.
There are some legal and some practical issues. If you have a contract which has five years to run, and which has a defined scope of work, then any changes to the contract must be negotiated rather than just added to the contract. This means that if they want any changes, you must be asked and accept the changes to vary the contract. That is the standard position with any contract. If there is a process for varying the contract, there must still be an offer from them, and which you may or may not accept.
So on a practical level it depends on how hard you want to push back on the changes as there will be an effect on your relationship with the committee. While they may not be able to impose the changes, you will want to preserve the relationship and perhaps come in with a suggestion that the contract doesnt permit the chnages but you are willing to renegotiate the terms if these are essential.