In order to produce the double homozygous both parents must be at least double hets (most people wouldn't call a cinnamon/black pastel a het but it is, they also wouldn't call a super cinnamon/super black pastel homozygous but it is even though the mutation is co-dominant (or incomplete dominant as someone recently argued).
Anyway, you could start breeding a pied to a cinnamon or black pastel. You would need to get lucky enough to produce a pair of cinnamon het pied or black pastel het pied and keep them back. Breeding cinnamon/black pastel het pied to cinnamon/black pastel het pied would give you eggs each with a 1 in 16 chance of hatching the double homozygous.
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