right! broombas should always be operated while sitting, for witchy flight safety :D

She have a handheld vacuum, just in case.

It presumably auto balances like a hover board.
But have you considered how painful it would be to ride a broom in the standard witchy way? Just a hard broomstick lengthwise in the crotch and your legs dangling either side. I think someone would last about 10s tops.