MikeTierce

I can tell you how I would disabled my Brigges and Stratton CO device
I certainly understand your issue the CO shutoff module didn't come out till 2018 so there are millions and millions of Generators out there that have never had one. While I understand the intent is for saving lives and their are mini people whom owe their lives to this type of device.
However people who purchase a generator with a specific purpose, location and enclosure to run it in are now adults / professionals subjugated to a nanny controlled device.
OKAY so this is what I would do if I wanted to disable mine. I'm not telling you to do this. This is what I would do hypothetically.
Open the control housing and you will find a small circuit board with a battery shouldered to it. At one end of the circuit board is a four prong connector I would simply unplug it. The four contacts do the following things. 1 connect to neutral
2 connect to Hot 3 connect to ground or chaise 4 closes or opens circuit to ground or chaise when CO is directed.
1 and 2 charge the battery 3 and 4 open close the grounding circuit allowing the motor to start or forcing it to shut off.