@Dusida ***
It can be done, you can talk to your current employer to give you a letter to cancel your visa in advance, according to the immigration, you can cancel it 21 days in advance.... then you go to lampang and start the process there.
I just canceled mine in advance till May 5.
Always remember to cancel the visa before the work permit if you're in Bangkok or else.... You'll overstay. 😊😊😊