So Personally I love DoctorWho, and if this could be done in a way that would work well then I'd say go for it, tho honestly I don't see a way where this would work effectively as a broom appearance, under the fact of positioning and how it would work, the Tardis really doesn't Fly it teleports yeah it is flying in space and stuff but honestly, it really wouldn't really work. I mean yeah the thing is a time ship so it's able to "Fly" but the point of the tardis is to move through time. if anything this would work better as a warp Key appearance situation. like if you have the wark key appearance be a tardis key, and then once pressed it would do an animation of summoning the tardis before tping you, that would work better. I love the idea, but the technicality of it all wouldn't work out