Should be able to navigate to ERULI with raw data (D10.6 IUM on the LOC), the missed approach to NIVER could be promulgated by NOTAM to follow the back course of the ILS to 2000 ft, and hold on a DME/LOC fix at the same position as NIVER.
I guess Finnair must have had its reasons to not undertake the advice given above, whether the decision was made solely by the pilot in charge, or in conjunction with the company's security and operations teams i don't know. Finnair generally does not seem/feel to be so risk sensitive (not a complaint, and I trust their professionalism to the best of my knowledge versus what might appear "cowboy" behaviour by some other carriers outside of the EU).