...and I didn't know about the multitool.  I've needed that forever!

I am curious, why 24-bit flac?  HPR shows being (mostly) mono, voice recordings don't typically need that kind of encoding.  I know that you are going to convert to ogg, mp3, speex and possibly opus, but still a 16-bit input file should be more than adequate in 99.999 percent of the cases.  Only when music is involved might it be necessary to use 24-bit, but even then, unless the source is recorded @ 24-bit it's really un-necessary.

Also, I was surprised there was no effort made to do noise removal, or level the tracks. I frequently notice level differences between the intro/outro and main recordings, levelling could go a long way to helping with that.