I know hacking a PDA is not an easy job.
But not to be totally fatalist we could step the discussion in several levels:

1. Would it work just wiring and driving CPU USB HOST lines as shown in schematics?
2. Could required CPU pins be available and accessible?
3. Could we find some room inside for USB HOST driver circuit? If not: Could it work taking the CPU USB HOST lines outside the PDA and built the circuit driver outside?
4. Could USB HOST lines be wired at motherboard?
5. Could be room left at motherboard for USB host circuit driver?

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