Take the bullet part out of the the whole cartridge , make home made bullet puller , empty up the powder , don't touch the primer .
Take an old plastic " Chappal " cut up little pieces so they can fit on the mouth , you have taken the bullet out of there .
Put the 1/10 powder back into the empty case , fill the rest with the plastic cut off piece , you got blanks .
You don't even needs to crimp the bullet and even the plastic piece doesn't clear the barrel once you fire , it's not safety hazard .
Take the fired cases back to the people to get your yearly quota filled , bring in new bullets , fire at will , reload with the rest of stuff you have taken out at the beginning and repeat when necessary
Wear safety glasses in the whole process
The only thing necessary for the triumph of evil is for good men to do nothing. - Edmund Burke