I don't know since I have never tried to do what you are doing. I would probably try to do the template edit, but you said you couldn't figure that out, so I was suggesting just writing your own code to do what you want and spitting it out in your own template. You will probably have to eval the template using the hook I mentioned and then you'll have to add it in somewhere into MEMBERINFO.

I'm not so strong with the if statements, do you have an idea what I would put to prevent it from displaying the topbar just for recent visitors?

I already said I wasn't sure and that you'd have to play with it. Looking at the template though, I'd guess you could use the variable "$id" Look in the page source and you can see what the id is for each of the blocks and then simply use it for the condition.