converting RST markup to Framemaker formatting?

We're in the early stages of converting our product's user manual to Framemaker, and are running into a couple roadblocks.

Our source documents were written using a customized form of reStructuredText (RST), which is rendered to PDF via Latex.

We'd like to be able to convert the RST markup into formatting that Framemaker can understand. We've tried a few Latex-to-Framemaker converters with limited success, probably because we've tweaked the RST somewhat.

Ideally, there would be a one-click conversion option from RST-to-Framemaker.  Barring this, we'd like a way to use search-and-replace (regex is fine) to find arbitrary RST markup and change it into Framemaker markup.

The Find/Change tool seems to allow you to change text to Character Formatting.  But this is only part of the battle.  We also need to be able to convert to things like chapter headings, index entries, links, etc. etc.

Any ideas?

Thanks,

Dennis