SLR, I say keep things simple.
My understanding (which I may be totally wrong) is this, you are trying to remove the supervisory restriction which is only in place when you do PPL stuff. If you are doing IR then you are not being supervised! So can the hours count, I am not so sure here.
Your other problem is this, you will need a CFI (?) to sign/recommend your restriction to be removed. If that person is also not sure about what hours to claim, then would he/she sign your application?
In hind side if I were you, I would have written to CAA to confirm your exact requirements, and appreciate if you share the outcome with us.