Hi,

I don't know about extending the existing cable, but it might just be simpler to get a longer one instead.

There were some PCs and Mac clones which used multi-device cables, and those are pretty long in some machines.

You could also get one out of a Quadra 900/950, or perhaps a Mac II.

I hope this helps. I don't really have any other ideas, unfortunately.

Hopefully someone else will chime in.

c