This is why proportional voting is good. The best answer is to give them more accurate representation as part of oregon.
Without some trade for like a blue part of idaho this trade just stacks the deck one way. not 100% of the people in those districts want to leave and there’s blue parts of idaho, why not trade those for red parts of oregon if it’s “just partitioning” why abandon the 20-49% of whomever is in those red districts that would go straight back to being unrepresented
No, this is just right wingers wanting things 100% their way with no reasonable offer on the the table. There’s no “legitimacy” here.