Foreigners and Thais don't need a medical cet. any more for renewing DL.
My experience with the Pink ID card is not much use. Did you know if you leave your province, you still need to carry your passport as the pink ID is not valid, read the back. If someone accepts it, it is because they are not used to seeing Westerners with this ID, it is really for migrant workers. I have a blue ID now, that has many uses!