Cyber arm DO make Bob strong, though.
I like style over substance as much as everyone else, but I don't like the idea of 'oh i have a rusty cyberarm because I'm a mixer and it fits'. I see what you mean, and I ran into the exact same problem before (wanted certain augmentations for a character purely for aesthetics, even if I had an IC reason) and it couldn't be done easily despite being a simple thing. But I think the ideal solution is both style and substance. You should be able to customize your cyberlimbs (and other hardware) but they should very much serve a purpose. You can already make minor/cosmetic cyberware alterations in your nudes (though it'd be nice if cyberneticists did these, similar to tattoos, one day we'll have clean, formatted nudes... And everyone will rejoice).
As for the OP suggestions themselves, I like them but I think those still come nowhere near close to making up for huge cost of having two cyberlimbs. Ideally for me, I want to cater less to the 'oh i had my arm chopped off and need a replacement' and more to the 'I want to enhance my capabilities for my chosen archetype, and see how far I can take it before PDS stops me'. We already have people IRL with cybernetic limb replacements today. Cyberpunk is people WILLINGLY altering their bodies for form or function.