Don't worry mate, think of it as a skills investment! I ruined about 2 blanks before I made a functioning knife - and even then it was not up to my desired standards. My advice would be to get a second cut metal file and hand grind the bevels. Use a piece of wood of any height (as long as it is flat) and then work out the distance you would need to place that piece of wood to produce the desired angle (for scandi 11 degrees per side). Clamp the metal down, attach your file to a strong dowel or other consitently shaped object, have the dowel running across your wood and file away!.
You can pick up the wood, dowel and second cut file from a decent DIY shop (don't bother with B&Q or Homebase - the quality of tools is shocking) for under a tenner.
Kind regards and best of luck,
No mistakes, only improvements
"never bluff, know your stuff" - Eddie Mcgee