Having difficulties with movements, I would suggest a good fanny pack made with a holster for your firearm. It's carried in the front or can be worn off center. With some practice, you can present your weapon rather quickly.
With the right pack, and a color other than black, I don't think it would be an 'obvious gun' statement.
This would minimize movement on you part. (A shoulder holster would not seem to be of much benefit if you have limited movement.)
Stay armed...somehow with comfort...stay safe!