What about feminized twists to Saints' names, such as Paula or Michaela?
Absolutely! This is done all the time.
Ummm, not quite, if you're in a Slavic culture. Greeks and some others freely use femininised masculine names (Georgia/Georgina from George, etc), and, less commonly, masculine forms of feminine names, but, unless you're a monastic (nuns are often given feminised male names at tonsure), that doesn't happen in Russian culture. By their reckoning, there has to be a saint of the same gender as the catechumen for the name to be considered acceptable. However, I'm happy to say that there are indeed female saints called Paula (an early martyr), and Michaela (New-martyr Michaela of Moscow, a nun, who was killed by the NKVD in 1937 - her patron at tonsure was the Archangel Michael). So, even if your priest is Russian, there should be no problem at all taking the names Paula or Michaela.