If those white tabs come out, it's childs play to put them back. On Cherry boards though, it's hell lol
I've found key swapping on G80s to be dead easy - pull up vertically, and off they come. [strike]These white tabs are only used on the space bar, and there you can unhook the stabilizer on the PCB if needed. (The other stabilized keys have the entire stabilizer mechanics mounted on the board.) The latter may require popping the lid off, but at least with the old-style case, that's not a big problem either.[/strike] On G81s, removing the top case is pretty much required for reassembly.
On my new Alcatel / Acer board, removing and reinserting the stabilized keys is dead easy, only putting back the space bar requires some more careful aiming. I'm not sure how it would have gone without the keys above removed though.