Se each one of these grants +1 to an attribute, which you can simply adjust for in the previous screen of the character creation flow.
E.G.
I want my char to be from the White that Wends, which grants +1 perception, which I don't need, so I just press back, set my perception to 9 (which will be 10 after I select my culture), and move my attribute point to whichever attribute I happen to need.
I never liked culture bonuses because they force me to make a decision between my stats and bonuses and the dialog I will get when playing the game. The system in deadfire solves this problem, but using the technique above seems like you could achieve exactly the same thing by simply not having culture bonuses at all.
Why not just remove them? I think the benefit of having the flavor of "chars from XXX are more perceptive" is pretty weak given that most people will adjust for it anyways.
Job bonuses seem more justified, IMHO.