Hi. PPI is deemed as an asset and, 9 times out of 10, is payable into the IVA. All firms are chasing this at the moment as it is their duty to get the best return for the creditors (and, yes, they get their cut too).
You will find, that, until PPI has been investigated the IVA will not be closed.
To be honest, and it pains me to say this, the best route is the one of least resistance where PPI is concerned. You have a year left -- many PPI investigations take longer than this, so the sooner it is started the better.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014