Is there any work around for this feature in Acrobat 9 Pro (which I have) or X (which I might be able to get) with JS that might create or approximate the image field functionality? Given the complexity and volume of JS calls, I can't see it being worth converting the form to LC and recreating is not an option at this point. Any advice would be welcome. Thank you in advance.
Unfortunately no, which is a pointless and silly restriction. Please submit a feature request for this in the hope that it may get restored some day. Feel free to add to this one: http://forums.adobe.com/thread/743823?tstart=0
This issue came up yesterday both here: http://forums.adobe.com/thread/844010?tstart=0
Though I'm not at all convinced that Leonard R. is right. Even if he is, it would make it out of reach of most.