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The best solution must be to add him to Halls of Thranduil so you can add him but if Thranduil is not a leader it will give an error.
It's still not clear to me how GW thinks this should work, but given that they provide some rules for allying Grimbeorn with different army lists, I guess the best solution for now is to provide a non-LL Beornings list.
Q: What exactly can Grimbeorn (and as a result, Beornings) be allied with outside of the Beornings Legendary Legion? (p.68)
A: Treat Grimbeorn in the same manner as all other Wanderers in the Wild. As a result, Grimbeorn has his own list of what he can ally with provided in his profile. Beornings can then be included in Grimbeorn’s warband as normal.