Agree with vi_, + there is simple workaround, allowing to both have swap on microSD *and* ability to remove backcover - glue small magnet on place, where sensor expect it. It doesn't require *any* hardware skills, and works great. I'm using it for ages.

Of course, if You do so, never ever take out Your SD card without unmounting it (=also set swap somewhere else, at least temporal), but if You're messing with such settings as proposed in this thread, You know it already.

/Estel