One option is to graft from a European Birch, another option is to plant some seedlings, but do so mid winter time so that they are frozen before germination.
Plant a few seeds into nutrient enriched soil and then water daily. Watch the tree grow but don't plant near another tree. You don't want the tree to get to big and encompassing over another tree so plant from a distance and plant a few seeds dependent on size of the tree you want.