I am afraid you might be wrong:
FCL.510.H.ATPL(H) clearly states that the applicant for an ATPL(H) shall have a CPL(H) and a type rating on a MP helicopter plus MCC course.
If you do not hold a MP helicopter type rating, you are not compliant with the requirements.
AMC 1 FCL.520.H. ATPL refers to an ADDITIONAL MP-type rating....otherwise 510.H.ATPL(H) would not make any sense..