It wouldn't be a pay to win game even with the limits sinanju has suggested. LFS isn't a free to play game and the demo is pretty unrestricted compared to a lot of other games so the demo makes that illusion that it is a free to play game with extra content packs that you can buy.
In my eyes the limits that have been suggested are pretty harsh but with some toning down they could work.
If you had GSCE on steam (either bought or added) before January 6th you would get Automobilista for free. As smove said the best chance you have is to contact the devs.
I will let you know closer to the time but I might not make it to round one. If I don't show up 10 minutes before gridding please ignore my time (It was rubbish anyway).