Thanks for replies. I should've clarified that I asked this question also because I know that many of the casinos on the strip that are owned by the same operators allow for chip cashing/playing at the sister properties... so I went out on a limb thinking that there might be a slight chance that LAS and the casinos may have some special agreement... but I guess not!
Ok, I guess I'll just take a shuttle to the strip, play a bit and then cash out.
(btw, mods - I'm not sure how I managed to start this new thread! my intention was to reuse the general las vegas airport questions thread... so feel free to do what you want with this thread!)