So, as it currently stands:
SSDD to F2 for seeds,
DBHP to F2 for seeds,
DBHP x SSDD to F1 for seeds,
Vote winner (or runner up if winner is SSDD) x SSDD to F1 for seeds.
That would be relatively easy for a group to accomplish and would produce enough seeds for all involved to have a nice selection of really superior genetics to sift through for future projects/collaborations.