Well, I'm aware of another way that also involves some serious madness. That's the Formula GT Championship.
Let me describe it :
15 races
Laps Track
60 Tokyo
127 Motegi (Super Speedway I guess)
74 New York
77 High Speed Ring
62 Grand Valley
23 La Sarthe
78 Côte d'Azur
113 Seoul
76 Infineon
85 Laguna Seca
64 Motegi (the normal track)
15 Nurburgring
64 El Capitan
67 Fuji 2005
53 Suzuka
At least, you can save after each track, but it's still mad
And considering you don't have the F1 to do it... I'm wondering if a Sauber C9 will be enough to win
Better let the PS2 24h on and win it with B-Spec on the Nurb.