Could you just stop the services associated with each?
No. Well you could but he wants lan access to his webpages so this isn't what he wants.
Edit:
Nice to se a Slovenian user for a change.

Lep pozdrav Damjan.
This could do what you want:
For this example the service you have installed is called 'manta' and 'nnn' is the TCP port number that needs to be closed. Watch your capitalization with the command below:
config set manta service access public status disabled TCPPort nnn
For UDP services, use UDPPort instead of TCPPort. Note that you can also set restrictions with ~AllowHosts and ~DenyHosts:
config setprop manta ~AllowHosts 1.2.3.4,10.11.12.0/24
config setprop manta ~DenyHosts 16.17.18.18
and then
signal-event remoteaccess-update