This is not a reflexive pronoun usage of 'yourself' ('Have you washed yourself?') Neither is it an emphatic usage ('You yourself should phone him') or (AHDEL)
1c. Used in an absolute construction: In office yourself, you helped
push the bill along.
or this set expression (AHDEL)
- Your normal or healthy condition: Are you feeling yourself again?
RHK Websters identifies this particular usage/s:
- (used in place of you in various compound and comparative constructions): Ted and yourself have been elected; a girl no older
I'd prefer it here; in normal conversation I believe it has the pragmatic advantage of not sounding too abrupt (I'd like both Bob and yourself to contribute a few pounds to the fund) or, as here, sounding rather matey (rather than highbrow; of course, tone makes all the difference). I'm surprised that a US dictionary (rather than say Collins) is the one to pick up on this usage.