In the interest of saving a few bucks, perhaps you could use a slip-on cap instead of cleanouts. If, and when you need to remove them, cut the pipe off a few inches back from the cap, leaving a sufficient length of pipe attached to the cap so that it can be re-installed with a coupling.
You may get a little wet while cutting off the end of the drain pipe, but you're probably going to get just as wet un-screwing the cleanout plug. And, if the plastic threads are damaged on the cleanout, repairs may involve cutting and gluing, anyhow.
