If anyone wants to see the script that's reading RGTP and producing LJ entries from it, it's here. It's very rough-and-ready, knocked up in an hour or so, and not something I really want to publish as an example of polished code, so treat it as pre-prealpha.
In particular, as it stands, it will fail the first time it's run because it always tries to read the cache, which isn't created yet. It's trivial to comment out everything except the part which saves the cache the first time if you're playing with it, but obviously it's something that should be fixed in a published version.
There's a huge thunderstorm tonight, with massive thunderclaps almost overhead; the power keeps going out. I hope this posts.