Perhaps, for the harder sleep schedules to get into (everyman and uberman) you could go through a sequence? I realize this probably won't actually work well for uberman since you have to sleep at perfect intervals, but it may be easier to get into if you've been on everman for a while, or I may just be making a fool of myself. I'm going to try biphasic for a while and then I'll move onto everyman if I feel comfortable. The steps for any progression would be:
Monophasic sleep: consists of 6+ hours of sleep per night
Biphasic: has like 4-5 and an hour nap (correct me if I'm wrong)
Everyman: 1.5-3 hour core and multiple 20 min. naps
Uberman: 6 20 min. naps every 4 hours

So what I'm planning on doing is:
Sleep 7 hours per night monophasic for a while (done)
Sleep less than 7 hours (pref 4 or 5) for a few days. If I feel tired on a given day, I'll start taking 1 hour naps starting that day and thus initiate biphasic sleep
Keep cutting down my core time gradually and add a nap (while reducing time of each individual nap) until I get to everyman
If I'm right, I could potentially keep gradually cutting down my core sleep and adding short naps to my day until it evolves into uberman.

Anyone have any thoughts? Is this idea completely doomed? I'm not sure it'll work for the further progressions like uberman but I'm sure it'll work for biphasic and fairly confident it'll get me to everyman.