Just got off the phone with Philip at CASA and he said it is not necessary to have sat the BAK exam or have a logbook if one wishes to sit the PPL exam simply for UAV licensing. He said many schools have cottoned on the need for us to sit the PPL exam while some schools have not. So I guess the best way to go about it, is to speak to a school first and check that you can just rock up and sit the PPL exam and whether they will need to see a exemption letter or not. If the school is asking to see your logbook, one can call Philip and he will write you a letter. You will need an ARN from CASA regardless.
As for the IR requirement, one would simply need to write Philip a letter stating operations will be line of sight only and he will reply with an exemption letter. While I have not yet flown my UAV, this information seems a bit overkill since beyond about 500ft, I doubt anyone could see something so small and normal aircraft aren't permitted below 500ft anyway.
Will be interesting to see which side of the fence this ruling falls on in the future.
I couldn't get much else out of him regarding timelines and new training requirements except that something will change in the future. Hope that helps someone.
Well, back to the books..