I think your first idea is good, i think this is what Alex would say himself. I wouldn't say the second thing about visiting regularly
John Anthony's 3 hookup objection handlers for pulling in nightgame are 1. "don't worry i have no sexual expectations" 2. "whatever happens happens" 3. "i like to let things unfold naturally"
Not sure if he he uses these over text though, he might use the first one over text.
I think John and Alex also said before that, if they liked a girl and the sex was good, why would they want to see her only once? and that they might communicate this.
So you could go with something like "if we have good chemistry, why would i want to see you only once?" or some other phrasing that basically communicates the same thing
I'd probably choose your first idea, or "if we have good chemistry...", and if she still objects, "dont worry i have no sexual expectations" or John's third objection handler, but of course calibrate to what she actually responds with after the first text you send.