“They also have varient NT canons, prior to standardization.
We don’t have a complete LXX manuscript older than Vaticanus. All the extant evidence confirms that these books are canonical.”
This doesn’t confirm anything. If it did, then it would also mean that a variant NT was the true canon, and that we’ve all been using the wrong one. Of course it doesn’t confirm that, and neither does it confirm that the apocrypha belong in the canon.
Which raises the question as to why you use the Catholic NT Canon, but refuse to use the Catholic OT canon.
You can’t point to one source as the authority for the NT and then turn away for the OT. It doesn’t work like that. If you accept the Catholic church has the authority to set the NT canon (which you do), then the rest follows from there.