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Rev Proc 2019-19 Appendix B section 3 offers some simplified methods of calculating earnings.

EPCRS App. A .05(5)(a) applies. You are not eligible for the safe harbor correction method contained in App. A .05(9)(b), which says that "in order to use this safe harbor correction method, the Plan Sponsor must satisfy the following conditions:....(ii) Notice of the failure...is given to an affected participant not later than 45 days after the date on which correct deferrals begin..." So calculate the 50% QNEC plus earnings, make the QNEC for the participant, and move on. It shouldn't be a lot.