Remap [C-]n/p keys in all modes

Question

I am trying to rebalance/distribute the workload from my index and pinky to other fingers but I keep finding modes/contexts in which I still need to use n/p or their modified version C-n/p in order to achieve what I want, e.g.,

1. C-c h: helm-org-agenda-files-headings
2. C-c g a: helm-projectile-ack
3. magit-status-mode

How can I ensure that all places where n/p are used as key bindings are remapped to the keys I select?

Examples

Basic motion

I have remapped n/p to:

(keymap-global-set "M-J" 'next-line)
(keymap-global-set "M-I" 'previous-line)

This way I can use my index (J) and middle finger (I), avoiding the big stretch from using index (n) and pinky (p). It has the downside that it involves more modifiers but since I use home-row mods, those are also in comfortable locations M(ring)-S(index) so it's not so bad.

Undo

In my layout, I have assigned the Esc key to my right thumb, so doing C-Esc is quite comfortable, compared to the default keys.

(keymap-global-set "C-<escape>" 'undo)

This mapping avoids using:

1. C-_ : it requires more keypresses in my custom layout since special symbols like _ are not in the base layer
2. C-x u: also more key presses

My current mappings file looks like this: weak-pinky.el

Magit motion

The following mapping follows the same principle, avoid over-extension from using the index (n) and pinky (p) fingers when navigating while in magit-status-mode:

(use-package magit
  :ensure t
  :bind (:map magit-mode-map
              ("C-S" . magit-section-backward)
              ("C-D" . magit-section-forward)
              ("M-S" . magit-section-backward-sibling)
              ("M-D" . magit-section-forward-sibling)))

The downside is that it also involves more modifiers, even if they are in comfortable locations:

1. n/p becomes C-S-s/d
2. C-n/p becomes M-S-s/d

Inconsistent motion keys across modes

One thing I don't like is that the keys for basic motion are not the same as those for Magit motion.

Background

I have gathered some data from my keyboard (qwerty layout) use and it turns out that n/p are the two most used keys on my right hand. This matches results from keyfreq and also my subjective experience of pinky pain related to the overstretching from going from n to p and vice-versa.

Answer 1

It seems that you want to globally remap C-n/C-p to other bindings such as M-j/M-i, which can be achieved by directly setting one keybinding to another:

(global-set-key (kbd "M-j") (kbd "C-n"))
(global-set-key (kbd "M-i") (kbd "C-p"))

Now, whenever you previously had to use C-n it would require M-j, etc.

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Regarding inconsistent motion bindings wrt. magit, you could similarly bring it in line with what you expect as follows:

(define-key magit-mode-map (kbd "C-s") (kbd "n")))
(define-key magit-mode-map (kbd "C-d") (kbd "p")))

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If you'd like to be able to toggle these bindings (or generally tidy-up the configuration), you could define your own global minor mode with an associated keymap, as covered in this answer to a related question.