Rootless walkeriana and nobilior divisions?

[Orchidreamer]

A few weeks ago I bought a C. walkeriana backbulb division (2 bulbs) and a C. nobilior division with 3 bulbs and a new growth. Both are pretty much rootless (I've been hoping they actually had some roots). Well, the nobilior has a few short root stubs. The other one has basically all dead roots. How hard do you think it is to revive C. nobilior and walkeriana? Does revival take a lot more time and effort than other catts?

I've successfully revived rootless catts before, but they were hybrid clones, not species. I don't have a greenhouse, so I have to make do with a home environment. I have them potted in large pieces of bark and watered with KLN weekly...