Lower linkage rocker arm
 

Is it possible to change a 2010 ec250 lower rocker arm linkage and fit a 2012 or newer rocket arm. So it will take a newer shock

No.
Where it mounts to the frame is different.

The 2011 Nambotin model did have the 2012 lower rocker arm.

Ok Thanksgiving

Can I get a rocker arm to take an eye type shock

I don't know of any.
I guess you can modify your frame to accept the new link.

You can't get your current shock to work for you?