Have any Savate fighters competed in K-1?
Yep. Ernesto Hoost has some background in Savate, in fact he was a European Champion. Hoost uses a lot of Muay Thai in his style though, and he no longer fights in a Savate style. Jerome Turcan is another Savate fighter who made it to the finals of K-2, but lost to Kaman. A French Savate champion named Rob Zanqifo also fought in that tournament.