Then why even have accelerated decay? Why not just directly change the ratio of isotopes in the rocks?
That would come a bit too close to claiming that the Earth is a deliberate lie. They need the apparent age of the Earth to be an incidental outcome of God's Wonderful Plan.
It would also (though this thought may be unworthy) give yer "creation scientists" and "flood geologists" too little to do. The closer they come to just saying "God did it. By magic. Because. So there" the less stuff they have to fill up their silly little "journals", and the less anyone needs them, since any damn fool could say that without the necessity for any pseudoscientific bullshit whatsoever.