The more I think about it the better this idea is. They're already travellers, clearly, know you are too, and if they approach you they're likely looking to fuck (end goal, but still). You're planting an idea in their head that they have to think about the whole time they're on their trip. It's like sp Inception.
I also don’t feel comfortable enough to just follow a strange man back home after meeting in the club so exchanging numbers and planning something later makes more sense. Even on their end, they have time to see who I am