I agree that if you go the Poppasketti route, it would be ideal for Phasma to not be in it at all. I have no clue how tough this would be, but what if fx work could be done to make Phasma a different commanding officer by changing her armour colour, dubbing a new voice with some alternate lines, and maybe something else to make her not so obviously Phasma. This would keep in line with other movies where we introduce cool characters only to have them die immediately, but doesn’t further do a disservice to Phasma. Maybe it’s the lesser of two evils??