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Have you had a soil test done so you only add what is really necessary? You are very lucky to have lady slippers growing and it would be a shame to lose them. When you determine the least your rhody needs, go as much organic as you can. I would steer clear of the lady slipper when applying anything. You also could contact a grower or retailer of lady slippers for more exact advice.

https://www.gardeningknowhow.com/ornamental/flowers/orchids/lady-slipper-wildflower.htm

You can contact a nearby orchid society who probably has annual sales. You also can search online for a reputable orchid nursery. Lady slippers are hard to grow outside of their native habitat but it can be done. They also are more expensive than more common, easy to grow orchids.

https://www.gardeningknowhow.com/ornamental/flowers/orchids/lady-slipper-wildflower.htm

We do not sell plants or recommend where to purchase them. We only offer information about them. I would recommend checking with your local nurseries or checking with online nurseries.

Please do not post your private information online and to the public. I will remove it this time.

While that does seem like it would be helpful, lady slippers are very particular in their cultural needs, so I would not attempt to alter its surroundings.

If there is a native plant society in your area, you might let them know. I'm sure they will want to take photos. It's not every day you see lady slippers in the wild. You are very fortunate, indeed!