Swapping the ds0 and ds1 lines on the Amiga 600 is very easy, even for people with low knowledge of electronics: just cut the two traces near the CIA chip and cross they.
They are in the 15 & 16 pin of CIA near the floppy header.
Then an external floppy will become DF0: transparently to the Amiga. No need to place something in the internal header.
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