The only gospel Paul knew was what happened before he wrote Galatians.
He said then that if anyone preaches a different gospel than that, they are condemned.
As far as what may or may not have been *lost* or *destroyed*, well, there’d be no way of knowing what was in them.
So, at that rate, I could claim some divine revelation in a vision, written on tablets that nobody but I have seen, and then start a religion promising that everyone who follows me will become gods of their own planets.
It would, however, be another different gospel than what Paul preached and he’s pretty clear about what should happen them.
So, you are a Paulean? All Paul and nothing else?