Remap locally without autocommands

[KabbAmine]

I know that the default mappings are defined locally, so how can I remap them?

Example, I want to use D for <Plug>(agit-diff) and nnoremap D <Plug>(agit-diff) is of course not the way to do it.

I can use autocommands (FileType agit,agit_diff.....), but is there not a better way?

e.g.

let g:agit_no_default_mappings = 1
augroup Agit
    autocmd!
    autocmd Filetype agit,agit_stat,agit_diff nmap <buffer> D <Plug>(agit-diff)
    autocmd Filetype agit,agit_stat,agit_diff nmap <buffer> q <Plug>(agit-exit)
    autocmd Filetype agit,agit_stat,agit_diff nmap <buffer> R <Plug>(agit-reload)
augroup END

Thanks in advance.