is there a way to set a particle's origin to its base rather than center?

I’m making a torch. It uses a single nonmoving particle that has a flame material. I would like the base of the sprite to be at the emitter’s origin. I know I can offset the location of the sprite. The problem is if resize the sprite I then have to adjust the offset. If I could just move the sprite’s origin that be great since I would be able to scale it without changing two values.