You can connect the root node of the PI TreeView web part to a querystring parameter in the URL, but it has to be an AF Element path. In the next major release of PI WebParts, we are adding the ability to connect the root node to other web parts.
Add the Content Editor webpart, set it to be entirely invisible, and then collect the AF Element path based on the ID. After that all you have to do is redirect the user to the same page - or another page - with the correct querystring parameter which PI Treeview will understand.
Check this thread for more details: