not only | never | nor + must + (inversion) – English Grammar Profiler

Point 217 in the category of MODALITY is defined:

invert ‘must’ and the subject after negative phrases, e.g. ‘not only’, ‘never’, ‘nor’, to change the focus and give prominence/emphasis.

*Note ‘nor‘ is already covered in other C2 grammar points.

This is extremely rare grammar!  iWeb doesn’t find or allow much detail for these searches.   The best we could do is:
nor must * _V

1 NOR MUST IT BE 71 2 NOR MUST WE FORGET 45 3 NOR MUST THEY BE 17 4 NOR MUST WE OMIT 14 5 NOR MUST I FORGET 12

6 NOR MUST WE OVERLOOK 11

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