Unfortunately PEinc answer is probably the best you're going to hear. SPW911 is not capable of LRFD design. The best you might be able to do is develop a semi-handcalc aapproach and see if you could copy the analysis output from SPW911 in an excel format, factor the loads and do your design checks.
While I'm throwing that idea out, I'm not sure I would recommend it or that it would even work since you're embedment is an iterative process based on your loads. As you factor them it's going to impact your depth and you'll probably need a spreadsheet that basically does everything SPW911 does. This would probably be more prone to error and less reliable (not to intentionally insult you're excel capabilities!) than a program that has been developed and proven in commercial use.
