Yep, as a composite monitor.
the Amiga 1000 has color composite output, so you can just use that...
Also, the 1802, I believe, has chroma/luma input.
So, you could get an Amiga s-video adapter (kipper and/or amigamaniac make them still I believe). Then you'd just need an s-video to chroma/luma cable (they aren't too hard to make, but are trickier to find pre-made).
s-video isn't RGB, but it's REALLY DARN GOOD.. ;-)
desiv