If you're using Tamiya's paints you're already using solvents (which is good because they adhere properly), so why care so much about the composition of the binder?
If using the correct thinner (as opposed to using cellulose or "lacquer thinner" as it's called in the USA) a matt enamel smells no stronger than Tamiya's solvent based acrylics and will be touch dry within 30 minutes and usually a lot less.
Unless specifically trying to stay completely water based, it seems an unnecessary restriction - especially when the word "acrylic" when applied to paints means virtually nothing about the characteristics of said paint because all it refers to is the binder. Acrylics range from water based latex types to very hot hydrocarbon solvent based paints and each extreme has vastly different properties, strengths and weaknesses.