putting them in a solvent like wd 40 will make it safe, but trying to dig at a primer seams to be a death wish lol, the safest way would be to take the bullet out then fire the casing/primer to clear it then but bullet back in.
Not a fool-proof method. There are a few videos documenting soaking in oils, water etc and while some primers were deactivated, some were still very much still lively.