Pseudobulb without roots, Sweet Sugar

[Blueszz]

4 weeks ago I repotted an Oncidium Sweet Sugar. The smallest pseudobulbs (back bulb?) came of per accident. It has 2 leaves (still green) but no roots at all.
I found on a forum that I could lay it a side (cooler, darker) in the hope dormant eyes would develop into new growth. That is what I did.
Once a week I gave the lower part of the pseudobulb a bath in a Superthrive solution.

I checked the pseudobulb today and indeed, a dormant eye came alive but is still tiny. The pseudobulb still looks firm and not too shriveled. It doesn't look much different from three ago.

I wonder what to do with it now.

- increasing light a bit?
- increasing humidity? (it will be 40% on average now)
- keeping temp lower than room temperature? Let's say 60F ?
- can I help rooting of the old pseudobulb with a rooting hormone like Superthrive (no KLN available here right now)?
- no live sphagnum moss available right now, but I do have beautiful dried NZ sphagnum moss.

I don't feel comfortable giving it a bed of sphagnum moss, I'm too afraid for rot in my climate (this time of the year). What about having it slightly above the moss. I thought of making it a mini green house from a soda bottle.

It's not that I'm desperate to save the pseudobulb and it's new growth (the original plant is very healthy and strong, with a lot of new growth) but it's a great learning opportunity in case I have to deal with the same situation in the future, for a plant that I really don't want to loose.

Nicole