In my very personal case I have got a full equivalence between my amendment 3 CPL(H) and all theoretical knowledge needed for ATPL; many others in a very close to mine situation have been headed to most of the ATPL exams.... they all have gone to the Courts for whats seems to be a very capricious application of rules.
When it comes to have not just the simple theoretical ATPL pack but also the full ATPL license you have to undergo a flight check, no matter if you are IR rated or not, if you have already a multipilot type rating or if you have feathers planted in your arms.
What is more, if you are IR (as I am) and take the ATPL (VFR) flight check then you become a sort of ATPL(VFR) pilot who can also flight in heaven knows what circumstances in IMC conditions.
In my opinion this should be one question to raise to EASA to have guidance.
Regards