Pic of the pump setup?
Just go 2" all the way.
Bury the line in your yard
May need an above ground P trap for back flow prevention a strategic spot any place on the line, toward the end is preferable. Buy a bush.
Saw cut side walk and curb to put the pipe in and cover with concrete again. Not sure about city permission to do so.
Simple solution but there is no room to go under the sidewalk and through the curb. It would create a belly in the pipe that would draw in water/debris from the street. The debris could block a check valve.
