Am I a good candidate for buccal fat removal? If not what would you recommend? (Photos)

Thank you for your question and photos. You may be a candidate for both buccal fat removal and chin augmentation, a combination that is often performed together to achieve the desired aesthetic result.
Buccal fat removal permanently removes the fat pad to reduce fullness in the face and provide a defined contour to the cheekbones and jawline. A chin implant may optimize these results to further refine and balance the facial proportions. I recommend scheduling an in-person consultation with an experienced, board-certified facial plastic surgeon who can help you decide on the best course of action.

You can consider buccal fat reduction. It will help with lower face fullness. However, it won't prevent jowling down the line since those two are not related.

Reading your inquiry I do not believe that buccal fat pad removal will result in correcting the area you mentioned is the cause of concern. When doing buccal fat pad removal the area to improve is the mid cheeks area, if you're after a more define cheekbone and contoured mid cheeks then you're a candidate but from what I got from your description what bother you is in underlips and chin area which won't be affected by this procedure.