Diabetics need to be physically active, and that isn't going to happen unless what you are doing is fun. There are few readily accessible activities more fun than bouldering.
Even if you finish work at 7pm and it is dark, cold and raining, the bouldering gym will still offer you challenges of every degree of difficulty.
Don't worry about the landings. I have had a lumbar laminectomy and have two screws in my ankle, but the mats are cushy enough even for my ageing body.
The two screws holding my shoulder together are not a problem either.