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Here's another example that might help: Gold laced Polish and Buff laced Polish have ALL of the same genes for the lacing. Except the Buff Laced have the addition of Dominant White gene, which causes the black lacing to "turn white".
In reverse, if you were to magically remove Dominant White from a Buff laced bird, the bird would instantly transform into a Gold laced.
So what you essentially is wanting a laced bird with Dominant White added.
The buff coloring on a Faverolles or Wheatens is completely different from the "buff" on those birds and in a sense, has nothing to do with the buff lacing. You'll never get buff laceds using those.... unless you added Dominant White (plus the necessary genes to make for lacing).
To do a personal test to see what type of white a bird has, breed the 'white in question' preferably with something solid black but anything with black somewhere on them will work. If the chicks come out mostly white(out of pairing with a black bird) or shows something such as white tails.. it's Dominant White. A good example of the latter is RIR rooster bred with a white hen(with dominant white) line bred for sex linking, resulting in the "white tailed red" sex links. This is the RIR coloring with DW added, causing the white on tails and hackles. To repeat- Dominant White mainly has an effect on the black pigments yet has little or no effect on gold/red pigments..