Can Camilla become Camilla the First, by the Grace of God, of the United Kingdom of Great Britain and Northern Ireland and of Her other Realms and Territories Queen, Head of the Commonwealth, Defender of the Faith?
She will be Queen Consort. Just as the Duke of Edinburgh was consort to the Queen...the official title of someone married to the rightful heir determined by birth.
I don't think the Queen would ever let that happen. She'd be rolling in her grave. Even having Camilla continue to carry the title of "duchess" is almost a bit of an ongoing scandal.