However, no one in the north desires to do so, or claims they need a flag from the civil war era to be displayed by their state government in modern times in order to celebrate state pride or local heritage.
There is ample precident that previous US flag configuration are indeed flown to commemorate "state pride and local heritage".
A few examples:
The 13 star flag is and has been routinely flown as part of 4th of July celebrations including over US navy ships and national historical sites.
The 15 star "Star Spangled Banner" is routinely flown over Fort McHenry.