If you're looking for the teachers with skills in differentiated instruction, the special ed staff is trained to have those skills; perhaps our tactic should be to persuade the school to use those skilled intervention teachers for all kids (including the gifted) when they are needed. Again, IME.
I think this is a good idea and is sort of happening with the paras in DS's school. A para comes in daily and helps with the reading stations, working with kids of all different abilities. They are not assigned to any particular kid. One of the schools in this district was very big into personalized learning. So each teacher had a class of about 40 kids, but also had 3 paras. The paras worked with small groups. So many parents loved this model because kids could work at their own pace. But the district did away with it and is forcing the school to become "traditional" because it cost just a few thousand dollars extra than what other schools in the district were spending.