What a great VTL! Congratulations! Once you have that going, you will use it much mor than you might think! It has capabilities that nearly no other machine has!
You would be able to make yourself some chuck jaws. I have made 4-Jaw chuck jaws in the past. And if I can, anyone can. I made them in pairs, starting with boring and threading a complete round hole, then cutting the blocks in half and milling the actual shape of the sliding parts after separating them. Milled the steps once they were otherwise completely finished by clamping them all togetether, Then turned a radius and grooves in the jaws fitted in the chuck itself.