Repeating what I said in comment section to not leave question hanging without answer, in order to bind one of Bash readline commands you can use
bind command. For example, Crtl+N shortcut can be used with:
$ bind '"\C-n": history-search-backward'
This will be limited to current session and needs to be placed inside
.bashrc to have it established in every one.
Expanding my answer, you can also modify
~/.inputrc file, as mentioned in link provided in question. There are two ways to do this. First syntax for same shortcut as above is:
And the second one is:
This second type of syntax can be used with
bind as well:
$ bind 'Control-n: history-search-backward'