Well, I have heard mixed views on this. But I don't think you will be able to that early in the morning.
First of all, I like your choice to try to do the early line thing by GRR to get to TSMM first.

Even though there are some DIS-ers who are doubtful of this tactic because they think it wastes too much time, we didn't find that to be the case and we beat a bunch of people onto TSMM who came in from the main gate. It's not always fool proof, as the CMs guarding the line by GRR may sometimes let you walk to TSMM earlier than 10:00 a.m. and get in the TSMM queue, and some are by-the-book and only want you to walk at 10:00 a.m. exactly. We got there before a bunch of people and we didn't have to wait and waste a lot of time at all, so it was very worth it in our case.
Now, from what I hear, when you go through the GCH entrance to DCA in the afternoon, you don't need to show anything other than your Hopper or AP. Early in the morning, before DCA opens, they are supposed to require that you show your Hopper or AP and room key to prove you are a guest at one of the three hotels. And if you are not staying onsite, then you would be out of luck at that entrance (though you could still go into DCA through the main entrance at 9:30 a.m. and walk to the line by GRR).
However, I recall reading a post or two on the DIS about some people who ate at either Storytellers or Whitewater Snacks and they showed their receipts and got into the GCH/DCA entrance. So it
may work for you, but I wouldn't count on it. But again, you can still get in the line by GRR. You just have to take the long way and walk through the main entry of DCA and walk over to it.