I had this combo, but decided to replace stem for new Tune. Problem of Extralite stem are small clamps, which are not able to hold bars without creaking. Schmolke recomends to use just 3Nm with Extralite stem, which is not enough for me. When I tried 4Nm, creaking and stiffness improved, but stem left cca 0,2 mm marks on bars. So Local Schmolke dealer recomended me to replace stem for Tune. It is cca 20g heavier, but performs much much better. (they lend me their Tune demo stem, which I use now for about week, before my new stem arrives )
I also talked to guy, who told me, that it should not be big problem to bond Extralte stem and Schmolke bars permanently together, so I think I'll try it for next season
But if You want standard bars and stem, avoid Extralite with Schmolke bars. Buy Tune and I think You will be happy with this combo.