Can you adapt to a polyphasic schedule by briefly replacing your sleep with a whole bunch of naps, and then gradually culling them back until you have just the right amount? User and brave explorer of possibilities "Forevernade" on the Zeo forums makes a good case for it:
"I have been had[sic] several adaptations, and because my first adaptation to everyman took me so long I was determined to cut the adaptation by a significant amount. After loosing[sic] the ability to get a quality nap, I thought what better way to learn to nap but to nap often? Frequency of a stimulus has often been shown to induce the quickest adaptation in biology, so I went with this.
I stayed up for a day and two nights, before commencing Uberman, and then used a weekend (2 days), to nap every 2 hours, on the dot.
At first I didn't nap, then later I started napping. By the night time of the first weekend day I was dreaming like when I was on Everyman, and by the second night I realised every time I had a nap I would simply REM like normal or I was simply not tired (so I began light sleeping through naps). At this point I started to cut out naps out, aiming toward napping every 4 hours, and by the monday day, I had naturally commenced Uberman.
Tuesday I was a little tired, and Wednesday I was sleepy, and by Thursday I was adapted. I never went through a zombie mode. I never had a drawn out adaptation, and it seems that the 'Naptation' I organised over the weekend got me into the rhythem [sic]."
Of course, like all adaptation stories, I'm hesitant to call it a "success" until I hear "…and I've been doing it for 30+ days now" — but as possibilities go, this is a fascinating one. I may even try it myself if/when I have to adapt to a different schedule.