If you could demonstrate that you were unable to effect a remortgage, then I do not believe that creditors would require you to sell your house - but not being able to get a remortgage in the current marketplace is relatively unlikely.
I am afraid that if you wish to avail of the IVA as a solution, insolvency practioners will be required to be paid for the services they provide to you. Therefore there will be fees involved, with are usually funded by the creditors by way of accepting a reduced overall repayment.
You should consider all options available to you, including bankruptcy proceedings and an ongoing Debt Management Programme before arriving at a final decision, but as you are aware there is no really easy option when it comes to dealing with debts you cannot afford to repay under contractual terms.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk