Is it possible to save this dendrobium?

[Ffion]

I've been pretty successful with dendrobium nobile and its hybrids, all growing and blooming for me, apart from this sad dude- which is very precious to me and makes me very upset. It is (or was) den Oriental Smile Fantasy, they are very very rare in Europe and I was so happy to finally obtain it - but it quickly withered

As you can see from the pics, there are 2 very shrivelled canes, some live roots but it hasn't grown any new root for the whole spring/summer. It was kept in the garden, in high British humidity and filtered sun- all other dens grew like crazy.

I was hoping at least for these 2 keikis but now I'm worried the canes are too shriveled to feed them to the right size of roots. And the keikis' roots are growing VERY slowly, the longest one is maybe one inch long and it's been growing since March.

What should I do to save these keikis? I was thinking about cutting off the cane and putting it with keikis into a moist sphagnum moss but again- isn't the cane too shrivelled already to support them?
Is there any hope for the mother plant?

Any help would be greatly appreciated, I'm desperate.