Just grab every cheap stamped wrench between 8-17mm you can for a while. I guarantee in the pile there will be five so perfect as cone wrenches.
I just used a 17 and a quad sized doe to adjust on my junker and a beer cost more than all the tools involved. The best multi wrench in useful factor was found in a hole in the street near my home.
It took a bit of effort to beat back the rust but the silly thing has been nothing but useful. Every other like it since has not been. And I paid for them!