I hope I can save you the trouble. The answer is no.
And it's worse than you suspect. Pocket Access was never available unless the device came with it.
http://www.pocketpchow2.com/where/where9.htm writes this another way.
Bob (now porting to Droid)
I have been unable to find any information at Microsoft Support or elsewhere that tells me if:
1. I can run a Microsoft Access application on my Pocket PC either under PPC2003 or Windows Mobile 5.0 OSes.
2. Whats the oldest version of MSAccess that will do this?
3. What URL can I find more definitive info on this topic?