I accept that a Cirrus with a wing(s) broken off could float upwards if the chute was deployed and it was inside a CB, because the descent speed with the chute is supposed to be no more than about 1000-2000fpm (10-20kt).
But it's only a matter of time before it will come down again. The CB will dissipate anyway in 10-20 mins.
The occupants might get a bit of hypoxia in the meantime
Back to the conductivity of materials, I think most people have got it wrong. Fibreglass doesn't conduct at all, and becomes partly conductive only when carbonised by the breakdown of its insulating properties. Carbon fibre is a pretty poor conductor but good enough to conduct the lightning, getting extremely hot in the process (and probably delaminating) through resistive heating. Metal is fine if thick enough, and all the airframe parts are well joined electrically. That is why IFR certified planes which are nonmetal have metal mesh buried within them. I have no idea if the SR20/22 has but it probably should have. Gliders have had their controls disabled after being hit by lightning which (obviously) preferred the control cables over the composite, and melted them.