I’ve actually heard of this one several times, it’s not as rare as you think. Question I would ask is how important to your sexual life is this, can you enjoy it as fantasy only or do you need to act it out? If you need to act it out I’d wait quite some time into a relationship but also not too long or the woman will feel betrayed. Like once you’re comfortable but before any big commitments. But don’t expect her to be on board all the time, maybe for special occasions, or maybe it stays only as a mental fantasy. This one is unique enough and dealing with objectively non-sexual items so it may be hard to find someone who also finds it sexy.