I don’t know of a pre-existing extension. I suppose you could code something in Ruby to just do the line division if that’s all you want but if this is a thing you need to model often, a Dynamic Component might as well be made so you can drop it into the model space and set up for the situation. Might be that a Live Component could also be made for this but I haven’t really dug into making them.
At least with a Dynamic Component you could also create fields for data output for things like the actual slope of the ramp segments, volume of concrete expected, and other information you might need in a report or for auto text in labels in LayOut.