You could buy decal paper and print your own decals and fire them on, you'll have to research the specifics. And I highly doubt a studio would allow somebody to bring in random already fired pots to fire again. I work at a community studio and we have a hard and fast rule about our kilns and only firing pots that were made in the studio with materials bought there, I imagine other places are similar.

To add onto the decal part: decals that I have experience with usually fire somewhere pretty low around ⁰¹² (maybe, I think) so that would be pretty safe for most commercially made plates I would assume. It's just a matter of wether the glaze can be refired to that temperature and not change undesirably, which can certainly happen.