[X2Go-User] Problem connecting via intermediate site

I have x2go working perfectly OK when connecting across my LAN, so the basics are OK.

However it doesn't work when connecting my laptop when I'm away from home (i.e. not on the LAN).

When I'm away from home I connect via an intermediate site to my home system, i.e. in my ~/.ssh/config file I have the following:-

#
#
# esprimo may be remote or local
#
Match host esprimo exec "hostNotLocal esprimo"
    ForwardX11 true
    ProxyCommand ssh cheddar nc -q0 zbmc.eu 22

host esprimo
    ForwardX11 true

So when I'm not on the home LAN I connect via 'cheddar' to my home machine.

Can I get x2go to do the same thing somehow? Or, even better, can I get x2go to use a connection already set up by ssh in 'ControlMaster' mode?

-- Chris Green