I think the Park idea is a very interesting one and maybe closer to what Cesar Chavez was about. Also adding signs ("Honorary Caeser Chavez Blvd.") to existing signs as was done in NW Portland with the Alphabet District works well.

Where in PDX would anyone find a street, where bringing attention to the struggles of farm workers for better pay and safer working conditions make sense?

That's why I really like the Park idea.
It represents families, schools, children, business, a place to refresh. It's a gathering place for everyone, and it's not going to reflect poorly on the the history and heritage of many different groups that built this great city. It might in fact bring them all out to one place to reflect on the "National Hero" we have all benefited from...Latino or not, and to mend the fence and BS that was tossed around last year.

What would Cesar Chavez have wanted?