I made a motion which I added to my character, later I created a bouncing transform with keyframes,

but now I realized I need to increase my character and also bring it forward on X axes.

I didn't found any solution to do this without editing every single keyframe.
Is it a possible to create a group form it and add new transform value on top of it (as pre-compose in After Effect)? 

I even tried to create action with collect clip from the transform keyframes but it doesn't working,
I saw a tutorial when it was done on a prop in the prop key editor but not on a character. 
Also is there a possibility to save the whole character transform (not just the 2D motion key editor) value into a motion? Because when I import it to my character it does nothing.

I would appreciate if somebody will help me to solve this issue of mine.