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What is the preferred method for combining BSDF files?

If I have two xml files describing parts of a CFS (such as blinds + window) what is the best way to combine their effect for: A. phase/matrix multiplication method B. classic radiance simulation

For A. I could see:

  1. use genbsdf with the materials assigned to two surfaces.
  2. using an F matrix type calculation as detailed by Greg at this years radiance workshop (link)
  3. adding both components to the rmtxop command when assembling the phases.

And for B. I could:

  1. use genbsdf with the materials assigned to two surfaces.
  2. model two surfaces and apply the BSDFs separately in the scene

I would prefer a method that results in a single .xml I can use across methods (and has symmetry with other materials I am analyzing that only have one layer).

Thanks,

Stephen