Update only speed on MoveP node

I’m trying to update the speed of a moveP node from a user input in my view part. The problem is I can’t seem to find any way to update only the speed. If I use the MovePMotionParameters, I need to specify all the parameters, but I want the enable the user to modify the other parameters from the move node. Is there a way to get the current parameters from a move node, and then create MovePMotionParameters from the current node parameters? Or does a better way exist? I’m updating the speed each time the user changes the speed from the view part of my URCap. But that would reset the other parameters to whatever values I’ve set them to in MovePMotionParameters as it is now.