Finding a layout that transferred the second snowflake half properly was difficult, as almost every possible arrangement crashes it into the bi-arm base. This one only barely avoids the crash, and I'm still shocked that it actually works.

I think 9 TI is optimal, unless it's possible to get a one-arm input-suppression system that somehow lines up perfectly with the four-atom splitter and doesn't crash the snowflake into its own base. However, I wouldn't be that surprised if someone managed to save some cost by reusing more debonders than I did.