You can certainly try that. We are heading into Fall so as the seasons start to change, your cutting if there is still no new growth, may just head into dormancy.
But if you want to uproot and check, you can certainly do that, and do a cross section cut on one of those branches, to see how far along the rotting has gone.
Just bear in mind, the shorter the cutting goes the less energy for that cutting.
Labor day weekend weather forecast is another scorcher, so position that part in part shade till that heat wave goes away.
