I'm not particularly interested in portable device only solutions so I can't help directly, but I strongly suspect that this requirement:
Quote:
The E-Ink Tablet is to be the ONLY device, from start to formatted finish (no rough writing on Tablet and finish on the PC.
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is the real hurdle that you face, especially if you are going to exclude web-based and commercial options.
I wouldn't even hold my breath for a future pipe dream on this.