Thanks for your answers!

@Forp: Gave me a way to achieve what I wanted much easier than what I intended to do. I am sure I will give your java scripts a try soon! Thanks!

@JoelKatz: Yep, I can see that this is the bigger picture and export/import of transactions makes a lot of sense. With this approach one can even withdraw money from the secured wallet without ever exposing any private key to the internet. Very cool, thanks!