Well I've been looking into editing the savegames using the tools for Neverwinter Nights, and it seems quite promising.
I'm able to open the savegame files with the example erfeditor found in the developers section of the NWN website, and it seems possible to extract and import files. (although you could probably also use the NWNExplorer found on the NWVault)
I've also been able to look at the UTC files (which contain the information about the characters) using a gff-editor (there's one
in the developers section, and I believe the author of NWNExplorer also made one, also available on NWVault).
I'll try some more tomorrow maybe, but I think it looks good, although it might take some time figuring out which number goes with which skill/feat/power/class...