Hi Edward, Sadly, yes, the shipping and risk of breakage would be too great. I hope you find a good home for them.
For anyone considering this offer, they're a good solid and quite accurately-made enlarger. The only niggle I have found, easily corrected, is that the column droops slightly when the head is near the top, which means you can't get accurate focus right across the image. It possibly doesn't matter in practice, but to be perfectionist I braced the top of the enlarger column to the wall, using threaded studding.