I believe you would agree sola scriptura qualifies as a principle and as incontrovertibly true.
Absolutely not. How is it possible for me to agree or disagree with an unstated principle? Put one in writing and I'll comment on it.
Is it on your own authority that removes it as dogma or that you do not recognize Luther or other Protestant denominations confessions as authorities?
Do you have a Masters in Non Sequiturism?
One more time, this time I am yelling:
THERE IS NO DOGMA OF SOLA SCRIPTURA!
If you are unwilling or unable to put in writing your understanding of Sola Scriptura I must assume you are playing games. Game time is over.
The term Sola Scripture to describe the dogma has been in use since the 1500s. It's foundational to Protestant theology. You could start with Luther and end with pretty much every current Protestant denomination to find their views on sola scriptura.
Here's one exosition:
Sola Scriptura from A.A. Hodge's "Outlines of Theology".
I doubt many Protestants would agree with you that it doesn't exist.