The Nomad spindle doesn’t have the torque for larger tooling when used in harder materials, and stock size isn’t really sufficient for larger tooling to pay off when one factors in the time for the tool change for most jobs.
That said, it should be possible to source an 8mm ER-11 collet and use 8mm tooling — in softer materials which it is suited for if the machine has the torque to spin the greater mass up.