Hi Nicolas,

this looks very nice.  And it seems to work mostly.  I've only tested it
in message mode.

The mostly is because filling does not work for me, neither auto fill
(subsequent lines start at column 1, i.e. not indented) nor M-q being
bound to anything orgalist related...  The latter may be due to my
configuration (*), mind you, but I haven't tracked it down yet: M-q is
bound to fill-paragraph when in message mode.  I have removed all of my
own M-q bindings I have, as far as I can tell.

(*) the problem with configuration files that can trace their history
back more than 30 years... sigh.

Thanks,
eric

-- 
Eric S Fraga via Emacs 27.0.50, Org release_9.1.5-269-g144451