As to bridging courses, I hear that Bristol Ground School can do them for helo pilots - are you certain?
On another note: interestingly, the first JAA CPL(H) theory course has just been started by Dragon Helicopters in Sheffield. They could convert the license for anyone wanting to come to this country I think. The details in front of me state that there will be nine exams clearing you for VFR ops only. this means that you could still be an instructor and line pilot to begin your career and if you wanted to go to the rigs or do twin IFR charter later on, you could bolt on the further 7 exams (IFR related) to get the frozen ATPL (H).
All sounds exciting since it brings the cost of becoming a professional right down. Hope this helps some of you who are scratching your heads due to the astronomical costs of licenses these days!