Oh, you were clear enough - I wasn't thinking
No, I don't think it's possible, except perhaps when the source is TAPE1 - that could make some sense if it's something else than a tape recorder.
Timer recording to TAPE2 is possible on BS6500. On that, you select CONTROL-TAPE2 before the rest of the programming sequence. I don't believe it works on the 5000 as it's not mentioned in the manuals, but worth a try I guess...