my suggestion would just be similar to above, use waist high tables/trays and no wider than 2 feet so you don't have to lean much.
drip feed perlite would be light and effective as would doing an aeroponics system then there would be no medium to cart/cary.
Of course if you are used to soil then it would probably be best to stick with it. a small diameter hose could be used fo watering and if it is automatic or just built in then you only need to set it up once.
I am fully able and couldn't imagine much the difficulties you might have but I hope you are able to figure out something that makes life nice and easy.