Westerns...

[Cabby]

Hey guys, I need some help. Is it completely out of the question to have a western in modern English. You know how like Game of thrones is obviously not modern but they talk that way with slang and swears.

I'm writing a western and was wondering how I should approach this. If I should disregard it and write in modern English (which seems lazy), try to do a mix of English with old west slang despite it being inaccurate (f-words, structure of sentences).
Or would I just be better off completely researching the language and going for complete accuracy (even though the story itself is completely fictional and pulpy (ala Game of Thrones).

I know I should ask this elsewhere but I figured some people on here might have some good opinions.

Thanks ahead of time 👍