Finding TLRs with accurate meters is a long and trifling journey. You can have two of three: Cheap, meter works, everything else works.
I'd either go with a non metered TLR and just use another camera to meter if necessary, or find another outfit. You can easily get 6x4.5 cameras with operational metering prisms (Mamiya 645 pro, Bronica SQ, etc.). You just miss out on the extra 1.5 centimeter, and get and extra two or three shots to boot.