Printing Modules: Modifications for ABS / ASA or Flexible Filas

Hello there,
after having a break from 3D Printing for a while i want to reactivate my SM1 and thought about setting up two separate printing modules, lets say one for PLA / PETG and one for ABS / ASA.

Apart from Fan Diverter and Flexible Fila adapters, what would you guys do to optimize those two modules in order to specialize them for different filaments?

i.e. I saw some threads about better heat break/insulation for the hot end from the rest of the Module; how could this be achieved?