Hi rachel and welcome to the forum.
In my experience there are not many mortgage brokers who have any significant experience of doing mortgages for folks in an IVA.
What the broker is suggesting is a Full and Final offer to conclude the IVA. Lots and lots of Q's before we could give you an answer.
What is the monthly payment into the IVA?
How many monthe remain
What soes the IVA say about year 4 equity release
What is the reason for the early offer
Which IVA company are you with ( some debt matters clients are having their F&F offers slowed right down now that debtmatters have sold the business)
Have you tried talking to Andrew Graveson of Bright Oak (
www.brightoak.co.uk) as they have some experience of IVredemption mortgages. I really would recommend you speak to an expert in this field.