You'd probably be better off rendering a 2D style scene using a 3D camera. Turn perspective off and you'll be able to easily switch from top down to isometric, you'll even get z sorting, rotate and zoom built in. You'll also only need one set of assets rather than managing a massive library of
sprites for each angle.
For example: This "2.5D isometric" style scene can have the camera yawed and pitched down for a flat/top down/tile view smooth and seamlessly.
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