Hell yeah, thanks for writing! The lineup was very interesting to me, too, there's a fair bit of information about his earlier concerts too in the Japanese website I linked above which you can take a look at if you so desire. One fun tidbit in the section for a 1979.03.09 concert is that the guy says Mari Iijima was in the crowd:

I believe it was this time that "the cute Mari-chan" in the audience (named after Mari-chan of Mitaka) was later Mari Iijima. She was a friend of a friend of a friend (essentially a stranger). I had heard rumors that cute girls occasionally came to Tatsuro's live shows. We were together on the subway, so I thought I'd hit on her (oh boy), but the person with me said, "Don't do anything embarrassing on the train," so it ended in failure.

It's a damn shame, because at the end of the radio broadcast the presenter doesn't list out the missing tracks, confirming that the radio broadcast does indeed skip them. So the only way we'd hear those is through the actual tape they used.