I'd love to be able to find a vintage high chair to use. I'd probably add a lap belt to it at the very least just to make sure the didn't fall out or something.
Children's- Custom Hand Painted- Chevron- Pink Elephant-Girls Rocking Chair-Baby Shower Gift, Nursery Furniture, Painted Child Rocking Chair
Antique painted wooden high chair with monogrammed cushion! LOVE! My child WILL have this!
A personal favorite from my Etsy shop https://www.etsy.com/listing/235570163/shabby-mint-green-vintage-high-chair
A Burst of Beautiful: Painted Vintage Highchair