Since the picture often tells the story, I just made up a quick example of what I was thinking. Of course you pretty much have to have the 2 Gs in different colors, or else the link effect isn't clear.

In my head, I thought in the area of the link, it might look like a "&" or "+". But it doesn't really do that. That's just the Arial font though, and I think it might look better with a different font. Oooh, I just thought of one that might be nice. I'll make up a quick sample, and brb

Edit
Ok, well the font I was thinking about (Copperplate Gothinc Bold or Light) turned out not to be so good for the linking. Well the Light version isn't too bad for what I was thinking. But the Bold version would be good all by itself, like in one of the arrangements you presented above. I noticed that in the Verdana font, the upper part of the G it a little bigger of a curve than the Arial, which might lend itself to linking. Both the Copperplate Gothic and Verdana shipped with Windows, so should be good for commercial use.
Anyway, just a couple of thoughts. Have fun designing
