Will be beautiful if I can use all of my opentype fonts!

Indeed it would! I assume that these are OpenType fonts with PostScript (Type 1) outlines? (As Prince should support OpenType fonts that have TrueType outlines).

We hope to investigate support for OpenType/PostScript/Type 1 fonts after the final release of Prince 5.0.

It's taken a while, but we've finally got a beta version of Prince 7.0 which does support OpenType fonts with PostScript/CFF outlines (.otf fonts).

And Prince latest builds now support subsetting for CFF fonts!