Little Froggie, if this is one of the few times with which we disagree, I would say we are doing pretty well, so far. 🙂
Now as to your quote:
“The setting of a propositioning”
I believe you meant “proposing,” as propositioning someone is NEVER a tzniusdig davar sheb’kedusha.
I still feel(albeit emotionally and without Halachic foundation) that the Kosel does not seem to me to be an inappropriate place to ask someone to agree to marry. If anything, to me the Kedushas Hamakom would inspire me spiritually to really feel awe-inspired at that moment, and to ask Hashem for a special Bracha while standing there. In the absence of an actual Halacha that forbids such a thing (and I have no idea if that is the case or not, so forgive my admitted ignorance), I don’t think anyone needs to project his/her own personal feelings onto it to say it is wrong. Maybe it is, but maybe it is NOT. What does Daas Torah say about this?