yes this is VERY possible. osmosis explained it perfectly. see when you're doing a reverse weave.. its the same exact hand motions as a forward windmill, corkscrew, 'figure 8', whatev.. just turned vertical. here check out my vid..
4beat corkscrew?
4 beat corkscrew

its the same motions as a reverse weave, reverse 5 beat weave, just rotated. heres some tips. when you're adding the extra beat to the top, move both your hands up with the extra beat. and when you're addin it on the bottom, make sure you move your hands down with it. this helps you from hittin your arms... which you'll see me doin in the vid lol. good luck with it man. hope ya get it down, its a very good move to have in your pocket.. people are like whoaaaaaaaaaa thats a crazy 8! lol. peace