Kashrut of a Milk Frother

This is a follow-up question to the answer I received regarding a milk frother. The device is made of non-stick material. Does it require treatment with boiling water? Also, regarding immersion, the problem is that it is a single cast without the possibility of disassembly. What should be done? Thank you very much and may you be inscribed for a good year.

Shalom!
Regarding treatment with boiling water — non-stick does not require it.
Regarding immersion — if it is impossible to immerse, a significant part of the vessel must be disassembled and reassembled by a Jewish craftsman. This is considered the completion of the vessel's assembly by a Jew, and it exempts it from immersion.
It should be something that requires craftsmanship to assemble. The assembly of a part that even an unskilled person knows how to do does not exempt from immersion.

Shulchan Aruch, section Yoreh Deah, chapter 120