Yes it would be overstepping the boundaries of tznius to ask the frum guys.
Pick a refined non-jewish girl (if you have those). You can identify the refined ones by their speech (they do not curse) and their dress (no low necklines).
Non-jews are not a different species of people, as I was shocked to find when I started college, straight out of seminary. They have personalities just like we do, and you might even identify with them and even (shocker) like them. However, it’s still important to keep a healthy distance.