The OP already expressed some concerns with Project Dogwaffle not being suitable for their needs.  I think they are seeking something that is more of a specific frame animation tool, with easier import/export than PD supports.  I must admit, I too had some frustrations when I attempted to use PD.  Anime Studio Pro is not bad, but is also Vector Based, unless using it to import frames created in another program - in this respect it makes an economical substitute for AE if you only mainly need a compositor.

Oh how I miss Deluxepaint IV and Image FX on the Amiga - those were perfect for this sort of thing.

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