Out of luck. I don't want to have to say that, but Bungie has no real way of fixing this without dumbing down the activity, and they can't do that. If you're having hard hard time with the jumping, you're going to have a hell of a time with the ads and bosses, because you'll need to be constantly moving around. It sucks that the reason you can't do it is because of something out of your control, but on the same note. Not everyone is meant to have everything. Sometimes, you just gotta deal with it. I do wish they had some sort of trading system in Destiny, so that problems like this could be alleviated, though. Probably won't ever happen, though.