This info is from CAA UK, (I'm in the same page):
Thank you for your email regarding the request for reduced training for the your ICAO conversion. Information regarding reduced training requirements for an ICAO CPL and IR conversion is detailed in CAP 804, Section 4, Part Q, Subpart 2 page 3 and 4. The minimum instruction time for a CPL is dependent on your total hours as a pilot of aeroplanes. Any requests for an additional reduction in training or different spilt between SIM and aeroplane other than as detailed in CAP 804 must come directly from the training provided. Please ensure that your training provider confirms the information relating to your FAA licence and that it is current and valid and that you have a current and valid FAA IR, type or class rating and FAA medical. Please also confirm the dates of your must recent flight test or flight reviews for your ratings on your FAA licence. We will also require details of your total amount of flying time .
So you need approval from CAA, with the proposed training path and any waiver must be requested.
http://publicapps.caa.co.uk/docs/33/...searchable.pdf