As rudestuff says, your airline should have already established your PBN privileges through recurrent training and checking. When the PBN requirements first came in some authorities issued a supplementary licence page, some reprinted the licence and endorsed it in the Remarks section.
The most straightforward way to get your multi engine IR/MEP class rating back is to take a combined proficiency check on the aircraft. Assuming you pass, you'll get your multi engine IR/MEP class rating back, and if you hold a valid SEP class rating you'll also get single engine IR privileges.
The proficiency check will involve a 3D (precision) and 2D (non-precision) approach. Make the 2D approach an LNAV RNP approach and you meet the PBN requirement of the check.
Good luck!
Last edited by Arrow Flyer; 21st Jan 2021 at 16:35.