My Wenonah Spirit (royalex) has no chamber, but has a bow slider. For years my wife asked  for some type of foot brace in the bow. I finally made one out of 3/8 plywood.  I cut it to the shape of the hull. It tucks up under the gunnels and braces against the grab handle then runs down to the floor at a 45 degree angle. A bungie cord attaches it to a cord run through the grab loop holes. The bungee allows it to hinge up and down and there is room to slide a dry bag into that space. I stuck 2 traction strips to it. I then made three legs to attach to the bottom so it doubles as a camp table. I am now back in good graces.