The area around Craig, CO is pretty easy to get around in. Not a lot of really high or rugged country. Mostly rolling sagebrush and cedar covered ridges and it has a lot of elk. That being said, any elk hunting will require some effort not only to get the animal but also to get it out.
If your health is so poor that you honestly think it will be somewhat dangerous to hunt elk then I suggest you find a good guide (I didn't think I would ever recommend a guide, but there it is) since you could rely on the guide to do the bulk of the major work. But, be advised, you would still need to be able to pull off the shot and that may mean you need to cover some ground quickly or get to a good shooting position. If you can't sprint 100 yards and shoot as soon as you are done, an elk hunt may be hard to pull off.
Probably not what you want to hear, but elk hunting is a physical game even under the best circumstances. It is what it is.