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I'm not sure it would be possible, but if it were possible, it shouldn't be too hard. You need to cross a blue to a partridge and then take the offspring back to the partridge to get the penciling back. The question is whether or not the blue gene would indeed affect only the black part of the feather and leave the mahogany center parts. Also, in using a blue, you would have a difficult time with the "Black" gene that would cover everything up on the first generation. Maybe a 3-4 year project to see if it could be done and a few more years to get any quality back of lacing.
You should get 50% Blue the first generation, probably with leakage. Those would get crossed back to the Partridge to try to re-establish your pencilling. It is being done in LF Brahmas with some success. That would be another option. Cross to one of those birds, but you would be fighting type and pea combs.
If you use a Splash rather than a Blue for your first mating, the F1's will be 100% Blue. Just gives you less F1s to cull, and more opportunity for selection. The Blue F1s back to the Partridge will then yield 50% Blue.