I'm not sure what you can or can't do as far as your disability. Do you have full range of motion with your arms and upper body ? if you're looking for ways to increase strength, but find it difficult to use weights, you could try resistance bands.
Resistance bands are an excellent way to strength train and many exercises could be done while sitting in a chair.
You can use wrist bands for some strength training exercises, but you definitely don't want to wear them all day. If you wanted to use them for bicep curls, lateral raises or shoulder presses, that would be okay. but wearing them for long periods does increase your risk for injury.
Have you ever tried resistance bands before ? If you're not sure where to start, you could start with Coach Nicole's resistance band workout. Her entire workout is done while sitting in a chair. this could be something you could do if you have mobility issues. www.youtube.com/watch?v=DC9jkkEjlLI