If you're any good at slipstreaming media I have a decent guide here you can follow http://www.overclockers.com/forums/showthread.php/781091-AMD-Ryzen-Win7-ISO-Guide
Used the gigabyte method someone mentioned in your post and damn son why you put in so much work when that method was instant and easy it preinstalled the usb drivers before the install screen so it went damn smoothly. was shocked how well it went, to be honest.
Todays rant: Banks and people who work at them that say the line "They should not need this" or "I know they said it is required but really it is not" you're all garbage people and I hope you get aids… that is all ps not just aids SUPER aids that kind drugs do nothing to help
Finally done all the paperwork for my house and found out the bank did not stamp something I told them was required but the lady said it was not at the bank (how lazy can someone be where they refuse to stamp something) and that made it so I could not use my main account for my mortgage so every 2 weeks I need to move money around... so dumb