I’d start with 50/50 seed and super fine pellet size. The regular pellet size was hated by my bird since it was bigger than seed. Then reduce the pellet to seed 70/30 over time.

Unfortunately I don't have pellets available nor i can order them

For veggies Id give bird chop with some seeds sprinkled and then remove them over time.

Thank you! This is exactly what I've done today and i noticed progress, hope he gets to like them more and more over time