Swapping Ctrl, Win, and Alt in MX Linux (Xfce) – Issue with Alt Modifier

I'm using MX Linux with Xfce and trying to swap three keys: - Ctrl → Win (Super) - Win → Alt - Alt → Ctrl Swapping two keys at a time works using setxkbmap, for example:

setxkbmap -option ctrl:swap_lalt_lctl

However, if I try to add a second swap, like:

setxkbmap -option ctrl:swap_lalt_lctl,altwin:swap_alt_win

I end up with a repetition of the same key instead of a clean three-way swap. ### Attempted Solution I created a custom XKB symbols file:

xkb_symbols "ctrl_win_alt_swap" {
    include "us"  // Keep the default US layout
    key  { [ Super_L ] };  // Left Ctrl → Left Win
    key  { [ Alt_L ] };    // Left Win → Left Alt
    key  { [ Control_L ] }; // Left Alt → Left Ctrl
};

I apply this with:

setxkbmap -layout custom -variant ctrl_win_alt_swap

The remapping works, except for one issue: - Pressing **Alt alone** produces Ctrl, which is expected. - Pressing **Alt in combination with another key** results in **Ctrl+Alt**, instead of just Ctrl. Why does this happen, and how can I properly swap Ctrl, Win, and Alt without modifier conflicts?