Not quite transient

Hi.

`wm transient' is almost what I want, but it does too much.

I have a main toplevel and some secondary toplevels. The exact
requisites are a subset of those listed on http://wiki.tcl.tk/3542 :

1 The transient window should always remain on-top, or in front, of
  the master window.

2 Minimizing the master window should also minimize/withdraw the
  transient window.

3 The geometry of the transient window should not change when
  moving/resizing/minimizing/maximizing the master window.

4 The transient window should never have an application (taskbar)
  icon.

5 The window manager should not draw minimize buttons for the
  transient window (only a close button and possibly a maximizebutton).

I don't want 1. The secondary toplevels can appear partially or totally
hidden by the main toplevel.

I don't want 5 either. The secondary toplevels must have a minimize
and maximize buttons.

How to achieve this?

-- 
Oscar