You can offer to settle at anytime but any offer would have to take into account any expected equity as per your equity clause. If you have substantial equity then you won't be able to remortgage but likely to pay an additional 12 months. Pain, yes, but will leave your equity untouched. This will all be confirmed in your original proposal .
Some companies are now insisting that you take out a secured loan if you can't remortgage, depends what it says on your paperwork.
Sharing from experiences of dealing with debt
The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively.
Bob Marley. http://kallis3.blogs.iva.co.uk
Any offer prior to equity release will need to factor in an extra 12 months payments if it looks like there might be equity there. To exclude those 12 months the IP might well have to conduct an early equity review.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014
Yes you can always make a settlement offer to your creditors through a variation meeting. Usually based on assumption that a 12 month extension will apply but as the others state, check your terms (and of course whether you have equitable interest over the standard £5k)