forget all about the IR(A). It is replaced completely by CBIR. I suspect it is only kept in the regulation for administrative purposes.
CBIR is reduced theory and reduced hours compared to the old IR(A), without any practical limitations.
If you want an IR you should therfore take the CBIR theory and then either CBIR or EIR practical (full IR or just enroute IR).
(for UK there is also the IR(R) though)
According to EASA you need to pass 9 subjects in the theoretical knowledge part to get a CBIR. How you manage with just 3 in the Nederlands is beyond my understanding?? Do you not follow EASA rules??