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First I'd like to properly fix the converter, after that it would be relatively easier to write new ones... but find time is a little bit tricky at the moment.
Starting this week, though, I should have again more time.

is there any chance or option to choose import from database backup instead of installed path?

The installed path is just to get the config file of the source destination.
SO you can just setup a fake "source path" with the configuration file of the platform and be done with it.