If Hebrew HD44780 display is not commonly seen, you will have to talk with an LCD manufacturer to make you some. I think it's on the order of 100 pieces minimal order. From your experience, do Hebrew characters fit in 8*5 dot matrix OK? I know you can't fit Chinese in that tight space. What price range are you comfortable with? I have an LCD supplier and I have thought about have them make a mapping with European characters instead of Japanese. They might be able to do Hebrew if they have the character ROM data.