Since you haven't stipulated dispies versus cloth, I'll mention that I think the cloth training pants from Baby Pants are awesome. In dispies, though, I suspect your best bets are GoodNites, UnderJams, or any of the zillion or so bedwetting pull-ups. There aren't any AB/DL disposable training pants that I'm aware of.
The closest think I can think of as a AB/DL training pant would be the Always Discreet. The smallest size they make would probably work just fine for you. They dont have a large capacity so far as Urine is concerned but they do have good internal leg guards (or leak guards, if you prefer) and are pretty good at holding a single bowel movement for a period of time. As with any diaper/training pant, it is always best to change it as soon as you can, and be sure to clean yourself properly even it means taking a shower (assuming you are at home when you change it). Also, use of a good butt-paste is wise also, if you are going to be messing a lot.