I like the idea of the removable panel, but in practice I don't know that it would work well. I can just imagine the small space between the tank wall and the removable panel to get nasty, and possibly even coralline growth. And if nasty algae, or whatever grows back there, than when you'd remove the pannel it would probably get lose in the tank.
Kind of recently someone posted on here looking into the market for a coating that could be put on tanks to prevent growth, and from the sounds of it he felt he was onto something and trying to get a feel for how much people would pay for it. Even if it does work out, I wouldn't expect it to be available for years though. It's unfortionat how slow it takes for some good products to become widely available.
for now I just contunialy scrap as part of my routine maintainance. Just another reason to mess with my tank