If you're not familiar with kettlebells, that's much too heavy. Unless you're already pretty damn strong.A proper KB press is very different from a barbell press, or even a DB press. Plus, only having one weight option isn't going to do much for boosting your press numbers. Could try stuff like handstand holds to build shoulder strength, then working into handstand pushup negatives, and eventually repping handstand pushups (all against a wall), then slowly progressing away from the wall and doing the same progression of holds -> negatives -> reps.