The fact that you don't use the stove doesn't change the need for a gas installation still to require compliance.
A bit like saying you don't use the back seat of a car, so it is ok to remove the seat belts.
Not having a dig at you 17triton, but just conveying a message
In a previous life before moving to Brisbane, plumbing and gas regulation was how I could afford to pay for my wife and daughters lifestyle. And as a result I have seen the results of gas use gone wrong.
Your mod is not a big issue, I could only see the worst result of the mod being a cracking or exploding glass lid.
I'm happy with a scratch or 2 on my lid.
Like you we cook outside and only use our stove to boil the kettle.
Enjoy