@script is only for Rename Scripts (although you can abuse them to do other things, in this case it'd just save you from having a .vbs file somewhere, so it's not worth worrying about until the script itself works, at least).
You can use dopusrt.exe to run commands (such as Clipboard PASTE) from outside of Opus (like a .vbs script), but I'm not sure if there is a good way to pass the multi-line clipboard contents to the script via the command-line.
You can get the clipboard in vbscript via some Internet Explorer scripting objects, but they force you to click a confirmation every time you use them, which is a pain if you want to do this a lot.
(By the way, your account is not linked on the forum, so we'll be less likely to answer your questions unless you link it.)