I have exactly the same problem - broken touchscreen and damaged LCD during disassemble the tablet. I've bought touchscreen replacement on ebay, but first seller send me some smaller touchscreen and now i've got the inverted one. It took about two months to get this crap!!!
The only way to invert the x-axis is to patch touchscreen driver, i've done it, recompile new kernel and now need working lcd to flash it. Can you post link where did you find Hannstar LCD?
And i think it is *edit* that original touchscreens have different versions.