There is a semi-automatic process in the ListImportWizard which you can use:
The Import and restart button in the third step of the wizard will add the entries to Stackz, then automatically go back to the first step of the wizard and clear the edit field there, all by preserving the "text-to-token" settings of the second wizard step.
The Start by collecting next lot checkbox will minimize the ListImportWizard window after the above button was pressed, and have it waiting for a "copy to clipboard" action. On the the next such copy action the ListImportWizard is restored, and it automatically processes the clipboard content until the last wizard step.
So to import a following lesson, it is sufficient to use the "Import and restart" button in the above way, then copy the desired content from the automatically appearing source window to the clipboard - the rest is automatic.