Found a way to get DMM with 0 class levels

[Anthrowhale]

If the manual of the planes critters are on the table and can cast spells, the sacred exorcist dip may even be unnecessary if you are starting at high levels.

A drawback of using form changing magic to access turning pools is that you can't simultaneously benefit from Shapechange[Tome Dragon] which can reduce the cost of metamagic by 3.