Canucks accept. I don't really love retaining on Schenn cause it wastes a retaining spot and I'd probably prefer to take a cap dump back instead but that's minor

Detroit accepts.

Boy, if I were a Rangers fan, I'd hate this strategy. Miller has only a year left on his contract after this one, so in 2023-2024 all you'd have left for sure after these moves is Chychrun because everyone else in this scheme is a UFA at the end of this season. In the meantime, you'd have given up Miller, Schneider, Chytil, Lundkvist, Othmann, two firsts and two seconds. To me, that's suicidal.

Im not giving all that up for Miller, thats ridiculous.

I really don't think you need the Chychrun trade. That said you could probably swap schneider for Nils. Also Arizona is not going to retain on Chychrun. Really i think you have too much going on that isn't needed.
I would do it like this
Lundkvist, 2022 1st and kravtsov for Miller at 50% retention. Keep Schneider at 3 RD, Schenn isn't really needed I don't think.
Scratch the Chychrun trade right out and keep Miller in at 2 LD.
Detroit trade is fine but we don't really need more future LD. I don't know much other than the numbers for Reunanen. I would rather take him and Chytil out and get Otthman or possibly the 2023 1st.