It would be safe to file a final trust tax return as you mention, as you can be penalized for filing a late return and that would guarantee that this would not happen. Then, report all of the tax documents on a new trust tax return using the new number.
I wouldn't bother to request the amended tax forms, as most companies will not agree to do that.
There isn't a tax form to report the change from one ID number to another, you should just submit a disclosure form explaining what you did with the two trust tax returns that you file.
Since you filed the first return correctly, you don't need to worry about it, plus if you file a final return using that number, the IRS will know not to expect another return using that ID number.
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