So you would breed a BLRW with what color Wyandotte in order to get the Violet Laced birds?
A Silver Laced cock over BLRW hens will give 25% each (large numbers) Silver Laced pullets;Violet Laced pullets; split silver gold & split blue silver/gold cockerels. Mate the Violet Laced pullets to a Silver Laced cock bird and you will get 50% Silver Laced & Violet Laced.
Here's my question: What if I take the same steps as above, only this time replace the Splash hen with a Self-Blue hen? I understand the Self-Blue gene should breed true, in that it is not incomplete dominant like the Andalusian Blue gene, but will it still dilute the black lacing to Blue? In a few generations, would I have the same phenotype bird using Self-Blue instead of Splash?
By Self-Blue I presume you mean Lavender. A Gold Laced cock over Lavender hens will give black chicks, these will carry one copy of Lavender,Pattern,Columbian & Melanotic. The cock bird will most likely be Brown & Gold based; the hen Extended Black & Silver. Mating these F1 birds together (& it will need a large hatch or a lot of luck) you will get mostly Black or Lavender birds, but also some Gold Laced,Silver Laced, Silver with Lavender Lacing, & Isabel ( the pale cream as in Porcelain Belgians) with Lavender Lacing.
As Lavender dilutes gold as well as black you will not be able to a dark red/gold bird with lavender lacing.