No, there is none besides Seblod Importer as far as I know.
Because Seblod is built on Joomla! and expands the database, the structure would be very hard to implement in an external script. Every content form is named - which is reflected in the db - and via it's free tables (and think also on totally freed ones which are not named #__cck_store_form_NAME).
But you could develop a plugin to do so. Hard work, I may. It would be a lot easier to create one demo content and duplicate it as often as you want to.
Best
Pierre.