XFCE + i3 (on Sid & LM 19)

So, installed i3 on both Sid and on Linux Mint 19, as an add on of XFCE, just as an experiment and to see how things how.
I do have a full i3 lappie, the glorious T43, but I wanna see how everything goes running i3 along XFCE... There are a couple of site on the internet with instructions, but those are sort of "Xubuntu centrist" and they also give you advise regarding installing third party PPAs, but I don't want to do that.
What I did was to install a "minimal i3", like this:

sudo apt install i3 --no-install-recommends

After that, simply disabled (set to Never) "xfwm4" and "xfdesktop" on Session and then on Application Autostart, add an entry to start i3.

Logout and back in and you are done.

Or almost...

On Debian Sid:
You can use the Windows key as the $modifier.

On Linux Mint 19 (XFCE):
You have to use Alt as the $modifier. or all Hell breaks loose.

On both of them:
Edit the "~/.config/i3/config" file and comment the 'bar' entry, it is at the end of the file, if you don't you'll have the i3 Status bar (printing an error) as well as the XFCE Panel.