Offline LAN party with CoH2

[Coz takhle dat si spenat ?]

Me and my friends are thinking about a lanparty, where 90% will be played CoH2 and Counter Strike:GO (so both Steam games that we all bought).
But the issue is, that the best location for the LAN party is without internet connection. ... Well yes, there is mobile network with some reaaaaaally slooooow internet connection (hardly to by used when checking for emails on smartphone), but I would rather put it, that there is no connection.

So the question is. Is there any way, that 4 steam friends can connect only via local network, not using steam internet login at all ? And after that play local LAN versus each other or bots ?

Or maybe the first user verification and steam login can be done over internet, but than the connection within the matches can be only LAN.

[datguy13]

Nope. Company of heroes 2 requires a log-in and active internet communication during gameplay to allow multiplayer functionality.

[Zeriel00]

Was about o buy but this kills it for me :(