Well if you think about them Tracks a bit some realy are on the edge and some are clearly not safe enough.
Grand Valley: I think it would be fine, maybe make a larger 1st Turn runoff and straighten the 1st turn Braking zone a bit, but rest of the Track is almost fine (compared to Tracks like Norisring where the DTM and Formula3 drives at).
Apricot Hill: Just Build it
Autumn Ring: Is fine too.
Midfield: 1st Turn Runoff, first Chicane runoff, 4th Turn runoff after that highspeed section, the chicane into hairpin section needs runoffs too. So needs some work but technically should be possible.
Deep Forrest: 1st Turn needs Runoff, probably 2nd and 3rd turn too, the Double left too, same goes for the last 2 turns.
All-in-all it just needs runoff areas and bam a fine Track
Tokyo: It sounds really like a Theme alert

RUNOFFS are missing

Compare it to Valencia and you get where runoffs should be added. But apart from that could be realized.
Cape Ring: No just no. Fun Track in game but the changes that would have to be made are too big I guess just skip that one. Maybe Cape inside or Cape South but that Loop and the "jump" .... no.
Trial Mountain: Really dangerous as it is but building it with fitting Runoffs would be possible.
Madrid/Rome/London: cf. Tokyo.