The cattle and humans on the Peninsula and down to San Jose are being herded into a corral. There is already a plan for El Camino Real devised by special interests through a group calling itself THE GRAND BOULEVARD INITIATIVE. The opinions of local cattle and humans do not make any difference. Pick your poison.

Mixing bicycles and automobiles within a impenetrable barrier is both unwise and unsafe. Neither Option 2 or 3 provide for such an impenetrable barrier.
Bicyclist make well have the "right" to be on ECR but they will always risk their lives but such a choice.

The Bryant Ave Bikeway in Palo Alto is a much better model.

Peter, the Bryant Avenue bicycle boulevard uses bollards (at Lowell) to prevent cars from driving through. Is this really something you are proposing for Alma? The Bryant Avenue bicycle boulevard is an option for Palo Alto because it is laid out on a larger continuous grid. Menlo Park is not. Menlo Park is a collection of neighborhoods, many of them with limited entrances and exits. There are three streets parallel to Bryant (Emerson, Waverly, Cowper) that run the same length from Palo Alto Avenue, across Embarcadero, across Oregon, across Loma Verde, on to East Meadow. So the bollards that prevent cars from using Bryant as a through street are not an obstacle to cars or to emergency vehicles. Menlo Park does not have a collection of parallel streets such that one can be blocked off to cars in order to make it more attractive to bicycles.