DLC region locked

Hello! I am new to the switch community. I just bought my first ever console (yay) as i really love pokemon. I just finished playing pokemon legends z-a and im olanning to buy the dlc. My nintendo account is based on US (tho im from philippines) and the cartridge of za is SEA.

If i change my region to SEA, buy the DLC, then revert back to US, will the game still work or no?

Please help a newbie out 🙏🙏🙏 thanks yall!