Lynx247, I do have the same plan as you with the exception that if I don't find a sponsor, I will probably get my PPL(A) + IR(A) instead. It is much cheaper, it will "save" the IR theory and the IR(A) gives credit towards the IR(H). It will also give me a financial possibility to actually practice some IR-flying since the rent of a Cessna is quite cheap as opposed to a twin-engined helicopter.
On the one hand the ATPL theory under the interim arrangement contains alot of fixed-wing only knowledge as opposed to Dragon helicopters' CPL(H) course. On the other hand there is very good feedback (questions) for the fixed-wing subjects which is of great help if you want to pass those exams.