Past in subordinate clauses

My first question is: what tense should I use in the sentence below if I want to say that writing doesn't happen(it's hypothetical)

''I wouldn't want to see what he wrote/had written''

The second question is: if I use past perfect in the sentence ''I wouldn't want to see what he had written,'' does it mean that writing happens before seeing? Is there any change to simplify the tense to past simple and have the same meaning in the sentence above and this: (''I'd take the thing and then you'd take the thing I had taken'')? For example,

''I took/had taken my keys before you came home''

using past perfect in the sentence above, we just emphasize the action happening before coming, but past perfect isn't necessary here since it's very clear. Therefore, past simple is perfectly fine. So would past simple have the same meaning as past perfect in the sentences below?

''I wouldn't want to see what he had written/ wrote''

''I'd take the thing and then you'd take the thing I had taken/ took''