How about a thumbdrive times 200,000?  Equivalent to 200 S9s using your numbers?

For your perspective, if you haven’t run the numbers yet…

Last year one S9 provided 20 millionth of one percent of total network hashrate. A thumb drive will do 1000x less.

You are free to mine however you want.

PlebeiusG

The idea of decentralizing mining is for many people to do a little in a way that scales and reinforces the network's resiliency.  How many people use bitcoin today?  How many would be OK plugging in a usb thumb stick on their lapyop/deaktops?  You are saying this is not possible?