Well I've just put three map sets in one image and am using them on my N95 with no problems. I used all.bat to unlock all of the maps and then selcted regions from USA 2008, Europe NT 2008 and Australia 2008.
I now only have the SW.UNL file, the gmapsupp.unl files are gone.
If you're going to try this I suggest you make a backup of your files before you do this, just in case.
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