Was the property included in your IVA - ie do you have a 4th year equity release clause? If not, the it seems to be a good idea to use the equity in the property now to get rid of the IVA. Your IP can put a suitable offer in front of your creditors, once an offer of re-mortgage could be sourced.
Good advice from Welsh Boy (who is a mortgage broker specialising in the adverse credit marketplace) with regard to rates. The mortgage marketplace is extremely fluid at present, and it is becoming more and more common for people to take fixed term products and then switch to better rates at the end of these. It is a gambol you take, but it would take away your debts for ever and bring freedom back into your lives.
Good luck and let us know what you decide to do.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
View my IVA blog at:
http://melaniegiles.blogs.iva.co.uk