Holy Oncidium!!!

[reinbo15]

I received this Oncidium NOID today, and it needs help. Or I do, I'm not sure which. This is my first oncidium, and I wouldn't be so intimidated if it weren't for the size of it. As you can see from the photo, it is GIGANTIC. That pot is 10 inches. The pot is empty...when I went to go get the plant I noticed that it had tipped over. It's old potting medium was rotten and there were cockroaches in it. Smelled pretty bad. I dumped the old stuff, but now I don't know what to do with it. It doesn't appear that the orchid was in contact with the medium before, it was just sitting on top of the pot, like it is now.

My question is, assuming I don't divide it, should I find a pot big enough for it and pot it up? Or would it be better if I just let it sit on top of the pot as it is? It is coming from a greenhouse environment into an apartment. It hasn't bloomed in years, and it is my sworn duty to make it happen.

So, if this were your plant and you lived in an apartment with northeast and southeast exposures with no balcony access, what would YOU do with this magnificent specimen? Thanks for any info, advice, or comments you care to share!

Lisa