Any good ideas on a good combination throw for Sode Tsurikomi Goshi against a stiff opponent?

Yeah try this...

You and Uke obtain regular grips. Now take your left hand and move it to his left lapel (like going for a cross grip). Take your right arm and pull it back fast and hard, breaking his grip on your right elbow. Now you should be sideways with your left hand on his left lapel. Move back in for the Tsurikomi-goshi throw with your right hand behind his neck on the lapel. Move your left hand back on his right arm. The throw is what ever you want it to be: Hane-goshi, Uchi-mata, etc. Or you can forget the neck and bring your arm way over for Maki-komi.

Yeah try this...

You and Uke obtain regular grips. Now take your left hand and move it to his left lapel (like going for a cross grip). Take your right arm and pull it back fast and hard, breaking his grip on your right elbow. Now you should be sideways with your left hand on his left lapel. Move back in for the Tsurikomi-goshi throw with your right hand behind his neck on the lapel. Move your left hand back on his right arm. The throw is what ever you want it to be: Hane-goshi, Uchi-mata, etc. Or you can forget the neck and bring your arm way over for Maki-komi.