How are you gonna get it in the top of a sealed conical?
Unless you are using a plastic conical. My conicals are 7 bbls and pressurized though so I may be thinking on a different level. But even my blickmann conicals with the pull top lid were impossible to skim any foam from especially squeezed inside of a fridge/freezer.
Regardless, much of the "braunhefe" will get stuck to the sides of the fermenter anyway and unless you are open fermenting or in a bucket I don't see an easy or convenient way to skim and I personally feel it is a very, very minor difference. I doubt many breweries are skimming from inside their conicals.