Nah, Rohloff = heavy and expensive.
My tensioner is a mix of parts you see.. An 05 cast (not cnc) surley body so the spring doesn't rip through, with a 5mm allen ally snap off bolt, a spring from a shimano 105 road mech, a metal jockey wheel with sealed bearings and a custom hook to go under the chain to stop it from falling off.
So it's lighter and better than a standard surley (Y)
THAT is a tensioner.