Good luck with those... now it's the critical moment. It seems this time is crucial for older seeds, either they have the force to survive and become a seedling or not. If they take too long the tiny root may become either rotten or dry as well (depending on humidity). It's something we need to fight with when trying to preserve heirloom strains. It seems not always they have enough energy to survive.
Let's keep our fingers crossed!
Vibes.
Using your teeth is actually better because your mouth has better fine motor skills than your hands and that's why . Sure, it's not very clean...I have cracked some with tweezers when they got soft, but they did not grow out more.