Well, when you lauch new Xomap server on :1, displays on tablet are change. So you can do something simular like this

in maemo:

Xomap -mouse tslib (--other params) :1

in debian chroot:

export GTK_MODULES=libgtkstylus.so
export DISPLAY=:1
xsetroot
icewm

And you can enjoy maemo X server without xephyr. After you exit :1 server, you are back in default maemo enviroment.

Problem I found:

2] I tried to enable display switch, using xmodmap and I mapped switch signal to +/- button on top of tablet.
According to xev, action si send, but Xomap ignore it. Maybe it's somehow connected with Xomap paratemer -switchCmd Command to execute on vt switch but I am not able to find more about this argument.

Advantage is, you can use your window manager with stylus support (at least in apps which support them. XFCE and other gtk2 managers should be fine. Who will try to install gnome? )

It's quite dirty solution now, I will try to wrap it into some nice script