Mark, i think you've just about covered the bases.
Sounds like the only piece of info you're needing is to make sure the length of the stem above the bend is same between "short" and "long" stems.
KP mentioned the 397 Canadian bike on ebay *appears* to have a long and a short stem. It does appear to me also, there could be a difference between the stems seen on this 397 bike.
Unfortunately, there is only one somewhat decent picture, which certainly could suggest long and short stems.
There is another picture, but it's less revealing than the other.
On another note, i would like to put in for 2 LH "long" stems and one "short" stem.