Customising date format on Marshmallow

It seems Google has seen fit to remove the ability to customise the date format from the
Date & time settings. Now this is tied to the system locale.

My language is configured to be English (United States) and I don't want to change that.
I just want to change the date format to dd/mm/yyyy or (even better) yyyy-mm-dd.

Is there any way to do that? Would doing so break anything?

I see many apps in the Play Store to change locale (language) but none stood out as being
able to customise only the date format. I'd rather not have to try them all out, if someone
already knows the answer.

MV
(P.S. Non-rooted phone)

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