Hi

As mentioned in the beginning, I did not want to go with a VPN, simply
because I thougt that I would have to "manually" install some kind
of VPN-client on client-side - and also to force me to think about those
wireless protocols

Now, I learned something new - the SSL VPN solution by Fortinet.
All you have to do client-side is open your browser (IE), enter your
username/password (AD, LDAP, RADIUS, but also an built-in database is
supported) on a secure site - boom, there you go with FortiWifi:
VPN over Wifi, with no installation client-side..

We tested it with FortiGate - works like charm. Now we have to buy the
FortiWifi.

Thought, I share this experience

Cheers