Advice needed: Phal with no root sin pot but good aerial roots

[kavanaru]

My boss brought me her office Phalaenopsis ("white with red lips" - all what she can say) and asked for help. She was planning to repot it, and found that all root in the medium were dead. The plant has very nice leave and aerial roots.

How would you repot this plant? there are no root that could hold the plant in the medium. I f I try to use the aerial for this, I would have to cover some leaves with medium and risk the plant to start rotting...

Any advice given would be great and very much appreciated!