Not all clubs need you to be a glider pilot nor do they require you to have tailwheel(also remember that plenty clubs operate Robins or Rallye's etc) time to be a tuggy. Plenty clubs take on PPL holders with no gliding experience, just get yourself out there and ask around. A tuggy with gliding knowledge/background is a bonus but there are plenty tuggies I know who have never set foot in a glider before.