Place the chocolate in a heat-proof bowl. Warm the heavy cream in a small saucepan over medium heat; when it comes just to a simmer, pour it over the chocolate. Let sit undisturbed for 1 minute, then add the salt and whisk the chocolate and cream together until smooth.
Scoop 2 large or 3 medium scoops of ice cream into each of four pint glasses. Drizzle each glass with 2 spoonfuls of the chocolate sauce. Top off each float with cherry beer. Add some brandied cherries and a drizzle of the cherry syrup if desired. Serve.