Thank you for trying to help me out. There was absolutely no room around the washer circumference to gain access for even a dental tool. I ended up having to crack the ceramic on the new plug, vacuum out the "tube", then remove the bottom half of the new plug. Voila!
To crack the ceramic, I used a chisel at about a 30 deg angle at the top of the ceramic and tapped it once with a rubber mallet.
The attached pictures show an old plug with a similar washer to show the problem and then the two halves of the plug. This ended up being an easy and relatively cheap solution. (A BMW mechanic said he'd have tried this same method.)
Thanks again for your willingness to help.
Paul