Fortuna

While in principle I like the fortuna design, I am wondering what problem you are trying to solve. Both fortuna and the current linux design are prng, both use (or can use) real entropy to seed their pools and to stir them up once in a while. Both should give random numbers that are impossible to predict, assuming the attacker can do almost anything except dump the entropy pool itself or control every bit of input to the pool.

One of the two might have a more pleasing design. But as long as both get the job done equally well, why would you want to do a replacement? You can easily introduce subtle bugs and, without a strong upside, I would like to avoid that possibility.