Is the switcher a DKB KwickStart II, that uses the 4 ROM setup? I was not aware that anything else would work.
Well actually, DKB made a couple different kinds of KwikStart, I have both of them. One is the 4 rom kind you describe, it will work in an A500 or A1000
There is another kind, with the long single rom chip, designed only for the A1000.