Planning to say (indirectly or directly) that you have plenty of options, in order to demonstrate your value, can easily backfire and come off as contrived & insecure... Especially if you
know you
don't have options. You'd also be qualifying yourself to her in a way, which is neediness.
Instead, let your actions during the date and perceived availability outside of it speak for you.
Now of course if during the natural flow of conversation you are able to cleverly & subtly insinuate you are a desirable man, that's another thing. But primarily this will come across more naturally by your confidence and social adroitness while on a date (showing you are comfortable with women because you're around them a lot), and your availability outside of the date (you aren't waiting by your phone for her text and overeager to see her & fit her into your schedule).
And as Rocky mentioned, bringing a girl to a social circle or environment that you are popular or known within is also a good idea, as it will establish social proof.