Wow...no one has any tips? LOL...well, here's what I've tried and it seems to work...Purl the first stitch, place back on the left needle, slip the second stitch over the first and put the stitch back on the right needle.
But a better result was this: I slipped both stitches purlwise, then put them back on the left needle, one at a time, twisted. Then I purled as usual. It actually was easier, although not faster, but it works.