The
PADI AOW course involves five "specialty" dives, two of which are required--a Navigation dive and a Deep dive, if I understand correctly--and three of which may be of your choosing from among the PADI specialty dives, such as Night diving, Peak Performance Buoyancy, Enriched Air Nitrox, the ever-ridiculed Fish ID, etc. The idea is to give the student a taste of different kinds of diving, in the safety of an instructor's tutelage. If I also understand correctly, your instructor said that of those three elective dives you could choose Drysuit diving. If that's correct, then my recommendation is to DO IT. The AOW dives are not intended to be challenging/difficult but rather mainly to give you a taste of a variety of things--"it's like a sampler platter," says PADI's webpage (see link above). I see no reason why you can't get a taste of drysuit diving while you're getting a taste of the others. It isn't as though the course is asking you to perform difficult skills while in a drysuit. You won't be "task-loaded," as we say. In AOW you're not going to be asked, for example, to repeat the more difficult skills you learned in the OW course, like donating a regulator to an out-of-air buddy, while in the drysuit. Choose Drysuit and Peak Performance Buoyancy as two of your elective dives and you should be in a good position.
All of us who took our basic scuba courses in a wetsuit and have since then, through continual practice, gotten pretty good at doing all the required basic skills in a wetsuit will need to re-learn to do those same skills in a drysuit if we want to get just as good at doing them. I don't think it's an exaggeration to say everything is more difficult to do in a drysuit than a wetsuit. But for now, if what I said above about my understanding of the AOW course is correct, I see no reason not to take it in a drysuit.