O "_nomap" do Google deve aparecer no final do SSID, enquanto o "_optout" do Windows pode estar em qualquer lugar no SSID.
Então, isso deve funcionar com base nos documentos abaixo:
SSID_optout_nomap
link :
...you can opt your network out by including _optout somewhere in the Wi-Fi network name (also called the SSID). For example, "mynetwork_optout" or "my_optout_network". When you do this, Windows won’t automatically connect people to your open network.
link :
To opt out, change the SSID (name) of your Wi-Fi access point (your wireless network name) so that it ends with "_nomap". For example, if your SSID is '12345,' you would change it to '12345_nomap.'