Most things are possible but whether it makes sense to do it given the Mesh structure of smartthings and the available programming tools is a whole other issue.
I approach this rather differently, and have my gate notification ring on my smartwatch. Very, very simple to implement, works perfectly.
As for the approach you described, the only person I’ve seen attempting anything similar is @Kristopher 's “wasp in a box.” That’s a microlocation system. But his “simple” version is pretty complicated, and it requires a significant investment in sensors to establish last location. Plus, you have to be able to rely on the person carrying the phone around all the time. Or adopting a detectable wearable, of which there are not many.
Anyway he is interested in projects of the kind you described, so perhaps he’ll have more to suggest.