The 'Project to Design' constraint does require that the component intercept with an end condition. So I don't think you will be able to utilize this in conjunction with a rule to force it to not go past the ditch bottom point. The only way I can think this could be accomplished is with a display rule. Perhaps a display rules that turns off this component if it cannot project to design and turn on a separate subgrade component that has a point with a slope slope constraint to place the bottom left point as in your example. So there would be a very steep slope (i.e. 1000%) from the ditch bottom and then your normal slope from the bottom subgrade CL point.
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