At one local bike shop they had some cable stops for converting to STI shifters that actually screws onto the shifter bosses. Now I have a couple little chrome nubs that actually look pretty slick. They gave them to me for free since nobody ever has need of them anymore. Check around and you might come up with something. Not just at the places with a bunch of restorations and used bikes, either. The place that game me mine is known for multi-thousand dollar carbon rigs.