Copy a Blog Template to a Different Multisite Network

I'm using New Blog Templates plugin to easily launch new sites within the same network...

What I'm after is a solution/process that will enable me to take a blog template and copy it to a different network. I have a number of networks setup which will be using the same network, theme and plugin settings - only the content will change. Its important that I have multiple networks - so just building out the sites on the same network is not an option.

Is there a way either via a plugin or manually e.g. such as copying databases that will allow me to do this. Getting my template into each network as a starting point is going to save me big time in site development and construction.

thanks for any help received.