Which company to build around single-mass swing wheel

Good afternoon, Is there a company specializing in the construction of (one-mass) flywheels? For my VW T5 3.2L 4 Motion there is only the original two-mass swingwheel to buy. However, I would like to convert to a single-mass swingwheel. Does anyone know a company that could build such a flywheel or can convert the original to single-mass?