Thanks for the recommendation, but drat, I got impatient and ordered the Catalogue Raisonne last night. Still, it wasn't too expensive.
I did, earlier in the year, see a bookseller at a fair offering the 2-volume Deboni title for a really nugatory sum - this was before I became interested in Italian glass. Completely kicking myself now for not getting it. I'll have to see if I can track them down.