Next thing you will tell me is that Shiva “at home is not always feasible depending on setup, timing etc”
Ummm…. gavra, shiva sometimes is held in another persons home due to various reasons. Among my friends, most did a lchaim/vort combo. Most of the friends who did this in a hall did so because they cannot afford a home large enough to host more than a handful of people at a time. The kallah’s friends would have to arange taking turns coming to say mazal tov. I think al tadin es chavercho is very much applicable here.