I did look at getting some Kii3 speakers but it's this sort of problem that puts me off, and the cost of them means buying a third one as a spare isn't really realistic.
I keep a pair of Audiovector towers as spares, bought used quite cheap. Not quite as good as the Focals I usually use (although some visitors preferred them) but more than adequate to slot in and carry on listening should the worst happen.
Added to which I know that the hassle of arranging a repair and boxing and shipping the speaker to be repaired is possibly something I would not be bothered to do (I work long hours, don't like to do more work when I get home) leaving me with an expensive white elephant.
'Know thyself'.
In any case, I find the touted advantages of active over passive to be overstated, sometimes alarmingly so. The Kii3 were a little better in the bass, that was about it. But I use a Krell power amplifier which doesn't really notice that it has a loudspeaker to drive, lesser amplification may not be so nonchalant.