Raising the concrete ... so simple, so elegant, so minimal in its negative side effects.
There would still be a need to mark out an angled fog line fore the pole itself but paving over the light pole foundation gives you extra width with no legal rangling.
I suspect that there is no more easement for a wider path. It is difficult to tell in portlandmaps.com because it does not seem to acknowledge the existance of the MUP.
The Sunset MUP is 8' wide; current standards are 12' - 10' as a minimum(MUTCD). I can't say with certainty but middle of the path lane striping may not be viable due to the designated lanes being of a substandard width. Might be something a silly as the act of designation a lane requires that it be X width setting in to motion a whole set of legal requiremnts. Besides, we can't see lane striping working on the Hawthorne, why would it be diffferent here?
Both Sides of the Coin
In every passionate disagreement there is a kernel of truth that the opposing side cannot refute.
The illusion that keeps us apart is that these opposing truths are different and implacable; they are different sides of the same coin and to deny the other side is to deny your own.
A coin, like life, cannot exist with only one side.