How would you translate something like “so that you are/can be X”?
I bought this so that he’ll be safe.
I want to do this for you so that you’re happy!
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Like mentioned in the comments you would use ように/ために. As for the question of how to combine this with adjectives and the copula you would normally use the adverbial form of the word in question. For example:
For the copula you can use である (which is another form of the copula) but I think in most cases なる and いる does the job better