That was exactly my reaction when I saw the advertisements for the "insert". With respect to the taste of varnish, we're all physiologically a bit different. I know another guy who didn't notice a varnish taste, as well. I'll be looking forward to an autumn purchase of a meerschaum bowl for my Falcons. Not looking forward to breaking that sucker in either.
While you're "on the line," so to speak, I've noticed that the Falcons (I have a standard straight and an International straight) seem to like plainer tobacco. I'm thinking that the system was designed pre- WW 2, and the use of aluminum seems to suit the pipes best when using a codger blend or an English. Is this a figment of my imagination or have you noticed that, too? Having owned an Austin Mini 1000 in my earlier years, and being half English myself, I know how quirky they are.