To answer your specific question, once you are in an IVA creditors cannot take any legal action against your property until it is sold, and if I were acting for you I would put forward the offer of the basis of a sale within the next few months, and ongoing payments until that time.
You do need to be careful, because with a background of a DMP, creditors may well see a five yeasr IVA with an equity release at the end a more viable option for them - but from your post you seem to suggest that your future rental will be more than your current mortgage payments, therefore eradicating your disposable income. It this correct?
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
To have me propose an IVA for you, please visit:
http://www.melaniegiles.com/ivaEnquiry.asp
See customer feedback at:
http://www.iva.com/iva_companies/IVA_Advice_Bureau.asp