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Selectively linebreeding a single strain from any of those breeds would produce the results you're looking for, and could be considered a landrace. All of my purebreds are landraces after I adapt them to my micro climate and local soil and environmental pathogens and endemic parasites and...

What are you hoping to achieve in crosses that couldn't be achieved with selectively breeding either Biels or Giants to your needs? These aren't particularly unheard of traits, though finding good stock rather than hatchery stock can be a challenge. Still not as difficult as stabilizing a line...