I think
Kirby should add an independent brush motor. Where? If they were to increase the gap between the nozzle and the housing a brushroll motor could be part of the nozzle attached to the back of it I figured since the nozzle attaches via hinge adding an electrical port to the machine probably integrating it into the switch shouldn't be too big a deal. Using this configuration it should be possible to have an electrified hose attach to that same point to power a mini electric tool perhaps a low profile power nozzle for hard to reach areas or other various tools.
With this they could also move to a grooved (serpentine like) belt for more user convenience.
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