FCL.740.A(b)(2) requires "a training flight of at least 1 hour with a flight instructor (FI) or a class rating instructor (CRI)." Neither a proficiency check nor a skill test is a 'training flight' and, therefore, would not normally meet the requirement. However, FCL.740.A(b)(2) specifically and solely allows "a class or type rating proficiency check or skill test in any other class or type of aeroplane" as an alternative.
Now, here's the difficult bit - a proficiency check for any purpose other than the revalidation or renewal of a class or type rating does not meet the requirement of FCL.740.A(b)(2). The proficiency check for the revalidation or renewal of an IR or IMC Rating is not for the purpose of revalidating or renewing a class or type rating and, therefore, does not meet the requirement of FCL.740.A(b)(2). There, that wasn't so hard, was it?