Usage:

Select loop edges along or across beveled loop and use script.

• Along - unbevel selection along beveled loop
  
• Across - unbevel selection across beveled loop
  
• Whole Beveled Loop - if need to unbevel whole beveled loop
  
• Bevel Scale - beveled loop scale control
  
• Remove Doubles - weld vertices if bevel scale 0
  

Demo 1:

Demo 2:

Demo 3:

Demo 4:

Demo 5:

Demo 6:

Demo 7:

Update 0.0.2: