Luggage transfer out of Saint Jean PdP?

I'm a 70 year old with bad knees and a heavily-laden bike. I left London about four weeks ago and will get to Saint Jean PdP in about a week. The first section out of SJPdP looks brutal: 1100m ascent in 20km. I can't ride this with my bike as is, and it will be a long push/hike-a-bike. But I would like to try with an unloaded bike. Is there a luggage transfer service I could use for this first stage of the Francès proper?