Alistair I too would reveg the pheno you wish to save.
Cloning fully developed buts will work but as you suspect you will have to keep an eye on mould. Do you have any H2o2; you could add some to kill all the nasty's when you mist.
They take a fair while to root, 20 days is the longest...
It should be ok, can you put it on the lowest speed? The only thing I'd be cautious about is snapping a stem, if it wasn't blowing hard enough to do that I wouldn't worry about it. I'd be surprised if two oscillating fans had too much affect on humidity.