Hi
If someone is interested I modified a little the plugin to include support for the Ps3dec tool.
How to use:
First of all copy all the decrypt files in \ThirdParty\PS3key in dkey format unzipped. The name of the files must match the name of the compressed isos.
Place the file PS3Dec.exe in the \Plugins\ArchiveCacheManager\Extractors folder.
Enable PS3dec in the gui e type iso in priority
Now every times that a new ps3 games is selected, the plugin check if the file exist in the cache folder. If not, extract the file, proceed to the decryption and place the decrypted file the archivecache.
For a complete experience a script that mount the iso and launch the emulator is required (like the one in https://github.com/ptmorris1/RPCS3-ISOLauncher-Launchbox)
Regards
ArchiveCacheManager.zip