Login Form within Notice of Need to Login

Ok, I've got this proceeding along rather nicely. What I'd like to do is to have a point in an article that says, "Whoa, stop, the rest of this is only available to members." In THAT form, I'd like to give them a link to subscribe, OR a link or form to login (if they are already a member). Ideally, it would be a login form right there. (I'm attaching a screen shot).

I've tried shortcodes and I've tried a PHP command, both in the "More" tag box on the options page. The PHP command for the wp_login_form is just ignored, and when I try a shortcode (e.g. [my-loginform]) it seems to simply repeat the text of the box in another box INSIDE the notice. (Wierd.)

So, I'm wondering if there is a way to do this that I just don't know about?