It is possible, but would require a lot of work to do. On the server side, remoting is listening for requests, so if know how to access that remoting server, can send it data. The trick is knowing what data to send because as soon as remoting gets the request object, it is handed off to the ejb handler for processing. If the data sent is not compliant with what that ejb handler is expecing, the call will fail.
In short, would just stick with ejb3 client as already does everything you would need to do otherwise.