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Singular they rule
(pawb.social)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
What is the singular reflexive form of "they"? "Themselves" sounds too plural. "Themself" is inventing a new word, which is not problematic, but if we're going to invent new words we may as well start using "ve" or "ze" as gender neutral pronouns.
Would you be convinced if you found out that "themself" had precedent dating back to the early 1800s?
Oneself
"Yourself" is already a plural with a "-self" suffix. "Themself" is the same thing.