Plugin to export XMP

I'm new to Lightroom plugin development, but I am quite familiar with the Lightroom application, SQL, and Lua. I really dislike how Lightroom does not allow XMP sidecar files for JPGs, even though that situation hardly occurs, it bothers me. So, decided to try to make a plugin and although the documentation is pretty good, there aren't many forums to ask for help.
Here is what I think I need to know how to do:
Is there a way of getting at the SQLite database directly?
The SQLite table Adobe_AdditionalMetadata has an xmp text column. It seems like it would be simple to export this to an .xmp file. I don't see any way of accessing it via the LR API though. Access each develop setting individually sucks because I'd have to construct the XML file, and even then, I wouldn't be able to access snapshots.
Is there a way I could trigger an export of the XMP file?
It seems as though the LR API works off context menu events, not Lightroom events.
Any suggestions are greatly appreciated. Thank you!

Funny coincidence, I just wrote a little XMP extractor plugin this afternoon, it's implemented as an export filter plugin.  (It is going to be a part of a bigger plugin later on.) 
I need it to extract developed XMP data, so I just use export original option and insert this plugin as a post-process action.  If the original is TIF, JPEG, PSD, DNG then the XMP will be embedded and I then use exiftool to extract it.  For other RAW files, LR exports XMP itself. 
Btw, LR export is quite fast when exporting original images, because it does not need to actually render any pixels...
Plugin is available from http://www.capturemonkey.com/xmpextract in case you want to try that approach.
There's no source there, but it is basically just calling exiftool inside postProcessRenderedPhotos method, less than 20 effective lines anyway

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