What I want to say is something like "if you choose A I think we will have to
do B"

But of course in English (and in Japanese) there are many ways to say the same
thing.

  * If you choose A I think it will become important to do B
  * If you choose A we'll need to do B
  * If you choose A I think we'll need to do B
  * ...

OR maybe even more of

  * If you choose A I think you'll also need to choose B

But again so much nuance. In particular I'm asking someone what is their
decision, A or X and I want to make it clear if if they choose A they'll
probably also have to choose B.

For example: "If you choose to buy the car I think you'll also need to get a
child seat.". In my exact case it's "If you choose the 3 monitor setup I think
the game will probably have to be redesigned".

But there is subtlety in that there the "I think" part. In other word I'm not
saying that how it is, I'm saying I think that's how it is.

So I was writing

「AにするとBにするのも必要となると思います」

but something just felt off. So I'm asking.
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usage
Can I say ~~~必要となると思います?
I think 「Aにすると(Aにするなら)、Bに(を)する必要があると思います。」is more natural.

For example, I translate "if you choose A I think we will have to do B" as
もしあなたがAにするなら、私たちはBをしなければならない(する必要がある)と思います。"
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Yes you can.

I think it will become important to do B

  * Bをすることが重要になると思います

we'll need to do B

  * Bをする必要があります

I think we'll need to do B

  * Bをする必要があると思います

"If you choose to buy the car I think you'll also need to get a child seat."

  * 車を買うならば、チャイルドシートも必要となると思います。

btw, there is a slight difference between となる and になる

  * 雨が雪になった // Rain became snow "naturally"

  * 雨が雪となった // Rain became snow "unexpectedly"

  * 彼に会った // I met him "accidentally"

  * 彼と会った // I met him "as expected"

Are you confused? Don't worry, I'm also confused.

in this case, you should use 必要になると思います

Random Japanese passing thru.
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answer