I personally think that all galaxies formed after the galaxy centric black hole.
BH jets are powered by exotic mass leading to galaxy formation.
If this is true, then the entire galaxy would have formed in a magnetic couple.
When the earth crosses the galactic plane, there could be a pole shift.
Other than making compasses go out of date every year, there is likely to be aurora light shows in unusual places,
Likely no real impact on earths ecology.
No matter how the poles are oriented, magnetic shield will still do the same job.
And it presents a unique oppertunity to study the earths magnetic dynamo.
Whatever works, use it.
A good idea stands on its own value independent of authorship.
If it stands or falls on the credibility of the author, maybe it isn't such a good idea.