They are definitely not serama, and especially not Malaysian serama. Malaysian serama have more extreme type than either EU and US serama; your birds don't have appropriate type for US or EU serama, let alone Malaysian. Serama cross is a possibility, but they are definitely not pure
crossing them to the silkies would yield birds that have normal feathering, 5 toes, a crest, some foot feathering, and black skin on some (or all) of the offspring
crossing them to the silkies would yield birds that have normal feathering, 5 toes, a crest, some foot feathering, and black skin on some (or all) of the offspring