I have a bike i commute on with trekking bars on. The tt was a bit long but even with a long stem, trekking bars position is pretty good. I rode it today in fact.
Trekking bars by their nature most likely wont need a short stem, but the bars i have are std diameter, not oversize, so keep that in mind for looking at stems.
I have inexpensive trekking bars , the only ones found around here, about 25 or 30 bucks, probably the same ones you americans can get at nashbar or whatever.
9 speed deore trigger shifters work great and can be found easily new, not expensive at all and last and last and last.
if you have trekking bar qauestions, ask.