I’m in an environment currently where I was told to attempt to avoid handshaking but that I may do it if necessary. Professionalism and good impressions are very important in this environment (first impressions are key, and I’m not given the opportunity to “make up” for my initial breach in protocol) and I was told that it is not preferred but acceptable. The well-known rosh yeshiva whom I consulted gave me the names of people who had received heterim from R Moshe for handshaking in similar situations.
I know it’s not something I should be doing, but I feel comfortable relying on the rav whom I asked.