And China loves you for buying all those battery powered devices. They are the source for 90% of the lithium batteries.

If you want to keep the pneumatic air tools, I might suggest a shut off valve at the hose fitting may work out OK. When the air is shut off and the pressure is bled off, the pneumatic connectors work really easy. A 90 degree shutoff valve is pretty simple, turn the handle 90 degrees and the air is either on or its off. If he shuts the valve off before he disconnects the old tool, he can blead off the air by pulling the trigger. If he has the valve shut off before he turns n the compressor, there won't be any pressure until he opens the valve. It could get cumbersome, but the 90 degree valve could be put on the end of the air hose instead of before it.