Third level chooser dysfunct in untrusted clients

[Andreas Wettstein]

> When I try to load the layout via setxkbmap from the untrusted 
> client, it says that the XKB extension is not available.

You could try the pre-XKB way and use an additional group instead of an
additional level.  xmodmap is easier to use for this than setxkbmap:

   keysym q = q Q slash
   keysym space = Mode_switch

and so on.  Note that even xmodmap must be run from a trusted client.

Andreas