A while back I heard of someone getting keikis to form by sticking spikes (with the node bract removed) into water. I tried it; it failed. I am sure it may work, but the percentage is probably low. I know Jim Brasch sells keiki-grow paste; he's on orchidmall. I've never used it, but have purchased "stop rot" from him, which is bordeaux in lanolin.
I have also heard of pulling the bracts off phal spikes and placing them on a small dish of moist sphag (and covering the top). Again, I think the percentage is low but may be augmented by hormones. This method might be more compatible with powdered hormone.