I bought a FR410, I am facing the same problem as you.
I am not sure is Hakko wanting to seriouslu sell this or not. or they are facing problem because of their very high price of acessories of this new family. I want to stock up the nozzles. The nozzle price is very high compare to their old family. I wrote to the local Singapore office, there was no reply. So I put a note at the hakko main website to the japanese. Then I managed to get a reply from the Singapore asking for my list. I gave her an order list of 2 of each nozzles, and told her to bring in for me. But there was reply fom Hakko Singapore for 6 months now. Now Hakko is playing a silly game to control their pricing worldwide, I used to buy direct from US or from China as I could get better price and service. For the new FR410 and FR400, the price in Japan and Singapore is better, but they still many time that of the old nozzles. I think I have placed too much faith in Hakko this time. My FR410 is an white elephant now. Just found that my old 474 could be repaired as the silicone film were damaged.