SSJVegetaTrunks seemed to have got night battles working in RTW see: https://forums.totalwar.org/vb/showthread.php?t=89367
did you mean you couldn't get them at all or just that AI didn't opt for them? And are you sure their generals have the required trait? Relevant trait/attribute is definitely needed in all versions.
Vanilla BI has
not sure if it is strictly necessary or not but it doesn't seem to hurt...campaign barbarian_invasion
options bi
playable
huns
........
......
slave
end
start_date 363 summer
end_date 476 summer
marian_reforms_disabled
rebelling_characters_active
gladiator_uprising_disabled
night_battles_enabled
brigand_spawn_value 10
pirate_spawn_value 12
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