@Rudheim Yes that should work as transmittance for Subsurface and SubsurfaceProfile shading models. Especially if using the shading model node: it is the same parameterization as before. We have conversion and setup working for that. It has been revisited in 5.6, the subsurface technique can be selected on slab now).
@DMDevil Thanks for the detailed report! I have added a task for us to check what is going on.