My advice:
Pollinate with "Exotic Star"
If you have quite a lot of bulbs of H.papilio, then you can actually observe sporadic formation of scapes at "unusual time" and then the stem is often conspicuously SHORT. This indicates, that the elongation of the scape had been delayed, so the scape initial "aged" to a degree within the bulb. A good method, to synchronize the appearance of all scapes is, what I found out by chance, to put the containers outdoors throughout summer. Then, at the end of September, new leaves will emerge in Abundance, and some weeks later the scapes will follow, and they will show up with maximal length.