Maybe the Irish CG rules require them to operate PC1? If so, there is indeed no RFM procedure that allows this from an elevated helipad. The RFM Part 2 elevated helideck profiles were designed to be flown PC2e, so there is a lack of data for the Take Off distance required which means you cannot determine where the first segment begins and ends (and by definition, the second segment) which means you cannot demonstrate obstacle clearance in the departure path.
That said, the Cat Ground Level helipad procedure should be usable on an elevated pad, and approval to do so should be relatively easy to obtain I'd have thought - maybe a letter of non-objection or similar from SAC?