I wouldn't mind since they would move little volume of air.
Just make some little boxes with many holes in the back ( same as Sd in total)
The speaker would have sufficient damping from internal volume above Fs and below,
the hole(s) makes the speaker see an open box. So the diameter of the hole(s) could
even be chosen for tuning at Fc.
the hole -one- needs to be acoustically treated; and the box medium density stuffed.
Acoustically treated means a grill or better a cloth - felt would be the optimum- with sufficient space (s) to let the air travel freely.
as the purpose is not to tune in the very strict meaning of the term ( as for find the right dampening of the cone trough TS parameters ) but to dampen...
well...of course Qts would be about 1 when right done