it is possible but you will have to chose from many offspring. and maybe breed back a generation with super silver haze if you get some kind of like what you want but maybe not as sativa. then keep cloning it because if its not stabilized and you mate it again its very possible you will NOT get the same plant. as you probably know each plant has its own unique characteristics and when you breed them you the seeds you get will be many combination's and varieties of the existing qualities.
You'd need a male White Widow that grew bushy and cross it with a strong sativa-like female. Sorry to answer your question with your words essentially.. but yeah it is possible, you just have to do the genetic picking.