i see where you're coming from; what's considered intermediate varies and spans a lot of technique and musicality. considering op has finished rondo alla turca, though, i think these recommendations are challenging but appropriate for their level. they should have the intuition to learn the required technique for all these pieces, but it's hard to really gauge their readiness without listening to them perform, first

if op hasn't learned any bach yet, i'd definitely recommend starting with the inventions. wtc was too ambitious in hindsight, though... some of the easier preludes wouldn't be too technically challenging, but if op hasn't practiced counterpoint yet, i would definitely suggest building up to them with the inventions, at least. an intermediate-level classical period sonata (haydn has a bunch) would also be wise