xorg without udev

hello

i am working on very tiny systems that do not feature udev or hal and trying to get xorg to work

for now, i have a working config based on xfree86-input-keyboard and xfree86-input mouse. and the following config file

Section "InputDevice"
        Identifier  "Keyboard0"
        Driver      "kbd"
        Option "XkbLayout" "fr"    # untested + we should be able to use environment
    EndSection

    Section "InputDevice"
        Identifier  "Mouse0"
        Driver      "mouse"
        Option      "Protocol" "auto"
        Option      "Device" "/dev/input/mice" # mice event0 event1 & /dev/psaux input/event1
        Option      "ZAxisMapping" "4 5 6 7"    # roller actions
    EndSection

    Section "ServerLayout"
        Identifier   "Layout[all]"
        InputDevice  "Keyboard0" "CoreKeyboard"
        InputDevice  "Mouse0" "CorePointer"
        Option       "AutoAddDevices" "off"
    EndSection

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... but i want something more generic than input-mouse and preferably without config files

i have struggled quite a lot with vmmouse and libinput to no avail

here are my issues :

1/ i could not figure out how to reference an inputclass instead of an inputdevice in serverlayout. this is probably documented... somewhere

2/ i am unsure which driver requires udev, hal and the likes. does anyone know ?

3/ i a wondering whether any of the input methods can work without the psmouse kernel module. i can deal with having that module ( either loaded or compiled in ) but it would be convenient to be able to test using a basic generic kernel with no modules.

4/ for some reason, if i do not declare a serverlayout, either xorg refuses to start, or it does start but does not load the input referenced in the packaged config files which all contain "inputclass" stanzas... anyone knows what i am missing ?

5/ using xwayland is an alternative i'd happily consider. does anyone know whether such issues are alleviated in wayland ?

6/ bonus question : do you know a reason to prefer using xorg's vesa driver over the framebuffer and the vesa driver in the kernel ? ( or the contrary )

i am testing in qemu should that matter
the distribution is NONE : this is a linux from scratch. it works like a charm for my current needs but i would like to allow to pack an additional mini-desktop

i am not interested in any comment that instruct me to use udev or hal or dbus or any such tools. NOT using them is a strict requirement here.

thanks a lot for any help you can provide