Several questions here. How is your French? I recommend avoiding any but the most generic accents and any sort of slang if you are not near-native fluent. “No manches, güey” sounds absolutely atrocious when coming from anybody who is not absolutely, completely fluent in Spanish. Even something as mild as “chévere” is embarrassing in anybody who can’t pass as a native speaker.
If you are near-native, then it really depends on how people in that culture perceive it. Some cultures are more sardonic than others, and you’d be an absolute butt of every joke in Ukraine if you tried to do one of our regional accents. If you are developing this accent, it must mean you’ve interacted with people from the region. If they seem fine, then it should be OK. There are cultures where people love it if you speak like them. But there’s no way to know without an in-depth interaction.
Also, prepare to explain that no, you aren’t from there but you have the accent because… If that’s not boring, then go for it.
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