On being able to rack the slide on a pistol, here is some food for thought:

I haven't seen the guy in several years, but we shot with a dedicated pistol shooter who had lost the use of his left arm due to a motorcycle accident.

He brought a special fixture to make it possible for him to rack the slide on his pistols. Essentially it was a 2x6 base, maybe 8" long, with a 2x4 fastened vertically down the middle so that the fixture resembled an inverted "T". At about the midpoint, the 2x4 had a ~5/8" half-moon slot cut vertically down one side.
The fixture was placed on the table, about waist high. To charge his pistol, he would hold the gun with a normal grip and, pointing it straight down, put the tip of the barrel into the top of the half-moon cut. Pressing straight down sharply, the slide would be restrained by the 2x4 but the barrel was free to poke into the cut-out.
Same procedure when it was time to show a clear chamber.
This idea won't work with every style of pistol but it worked well with a Browning High-power and Glocks.
It will take a bit of practice to get the technique correct.