Not sure about Orps specifically, but I have seen it somewhere...
Work towards getting cuckoo Lav females... from your offspring with this Sire and your Lav hen and eventually using a solid Lav rooster and barred females you can produce 100% sex linked Lav chicks... males will have a white spot on their head. Harder to discern with lav than some other colors, but with practice, very doable.
Buff cross to Lav... somehow, not sure how many generations and such but your get Porcelain aka Blue cream depending on which breed we are talking.
Welcome to the wide world of chicken adventures and never ending learning fun!