Maine's not that far and would make a fun ride.....
Seriously though, I thought about creating one like my motorcycles shift linkage. It has an adjusting nut in the center. Loosen the jam nuts and turn it CW or CCW to lengthen or shorten the linkage. This way the adjustment can be made without removing the linkage on either end.
Or something like this: (just larger, beefier and with the proper ends on it)
https://www.amazon.com/ShareGoo-Adju...4&sr=8-36&th=1