>>6128753I did actually check rebrickable, and almost all of the dark red pieces do exist in dark blue, but some modifications are gonna need to be made to accommodate the unavailable pieces, especially for the top half of the dish. And I know for a fact that the arches above the fins exist in black, so I'm good there.
Either way, worst case scenario I just give up on the Jango palette swap and keep it in Boba's color scheme. It's such a nice ship, I just know I'm gonna kick myself in the future if I miss out on it now when it's available.