Hi! I will be flying out of CDG 2G and will arrive at the airport by RER.

I would like to know if it’s possible for me to follow signs to 2F, check in there (incl. checked baggage), use the lounge in 2F and then take the bus over to 2G.

Or is it mandatory to check in and go through security and use the lounge of 2G since my flight leaves from here?

Thanks!!