Armrests that attach to desk

I have little short little T-rex arms, so I find chair armrests to be just a little to distant from my keyboard and too wide for a standard non-split keyboard. Has anyone had success with the armrests that attach to the desk itself? Also, does anyone have recommendations for ergonomic footrests? Are there ones that attach to a chair?

What I've come to realize is that I'd love a split keyboard, but before that I need to get it set up so that I can support either my forearms or my elbows in a position that makes sense.

I just removed my underdesk keyboard tray because I just couldn't seen to get it in the right position, and I was constantly hitting it with my knees.

And finally, just a reminder. If you're due for a colonoscopy - go get one. Cancer sucks, radiation sucks, chemo sucks, peripheral neuropathy sucks.