the pleasures and sorrows of singular they

Are you an excellent primary teacher who prides themselves in their method of delivery of the national curriculum?

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[A commenter has taken this to imply that I think singular they is incorrect. I don't. I think it runs into problems when it needs a reflexive form. We have both a singular and a plural reflexive form for you: If you pride yourself (singular); if you pride yourselves (plural). The form themselves, in this context, seems to me as a result to revive the plural connotations of they; this strikes me as stylistically infelicitous after a singular verb. It is presumably correct, since the alternative would be themself (v. Arnold Zwicky on Language Log on singular themself), but it's clumsy.]