Maybe you shouldn't be taking "the easiest route" to get on the sidewalk. Especially since you are aware that cars rarely stop where they are supposed to.

Part of my commute took me over a bridge to a MUP. To get to the MUP I would need to either ride on the sidewalk over the bridge and then merge, or slow down and use a sidewalk ramp where my turn was. Most of the time I chose the sidewalk ramp.