These clients have been awesome. I explained the situation, said if they wanted to use the flooring they selected and had already been delivered, we have to do this. Or they could just cover it back up with carpet
They noticed a difference after we used the quick drive to secure the original subfloor, and were amazed at the difference the extra layer of 1/2" made
About 500 sf of floor down, another 1600 to go (in stages)
-Rich