While the premise is odd, Simmons succeeded in creating a work where it is easy to forget that he is not (by far) a contemporary of Dickens and Collins; his style and narrative in Drood are eerily close to how Collins (and his contemporaries) wrote.
Most readers will know Simmons from his lauded Hyperion Cantos. Drood though, is something else entirely, but impressive nonetheless.
For anyone who likes Drood, Simmons has many other excellent novels worth checking out. In addition to the ones already mentioned to others I really enjoyed Illium (scifi take on the Illiad) and The Crook Factory, which is based on a true story about Ernest Hemmingway running a spy ring in Cuba during WW2. He uses actually historical documents in the story which is pretty neat.
Then you shouldn't be teaching them. Learning about a world that's strange to you is one of the great delights of old literature. It's called "education."
A good teacher assigns works which lie just outside of the pupil's comfort zone, but not so far out there as to make reading a chore. Want to assign Dickens? Go ahead and read the Christmas Carol at this time of year; it's short and not too hard to grasp, and with enough hooks to go into Victorian society and other related topics. But assign David Copperfield? Great book, but for teenagers way too long for a work that old and removed. A teenager could read four novels that do connect with them in the same time. Sure, some teens might be ready for it, but it's not for everyone.
First, get them to read. Any book. Teach them that not all books will work for them. Skip that step, and you lose most of them as adult readers (the status quo by now).
We now have a 20-year long large-sample test : lots of kids (then) read only Harry Potter books. Did they turn into readers of other, better books? I honestly don't know, but I think you need to be open to empirical tests of the hypothesis, whatever the results show.
Your argument works just the same as "my kid hates his vegetables, so he just eats burgers, fries, and ice cream." A good parent strategizes this problem rather than just giving in.
He had a gift for throwing in minor characters that still stand out in your memory.