I say you do a 1nzfe/fe-x frankenstein swap!
Take the head off a 1nzfe engine (xA, xB, Echo...) and the block from a Prius 1nzfe-x
A stock Prius has a 13.0:1 comp ratio.
I've heard that it's possible to reach a 13.8:1 comp ratio with the frankenstein swap.
Heck, I'd be fun!
By the way, does the Paseo come with a FE series engine as well? You might be able to match up your shaved head with the higher comp. block.
Who knows?