Hi
@JustJack
I would also like to start walking on the GR65 before connecting at SJPP and have done a bit of research into it the past. Some resources that might help:
Depending on the time you have, you could start walking a bit further back from Condom or Nogaro (which has bus connection 934 to Aire). Bus 952 runs betwen Condom - Nogaro. See
LiO bus and go to the Gers tab for details.
There is also pilgrim transport available through
Valises Saint Jacques.
A possible route might be Paris - train to Agen - bus 953 to Condom - walk/connect to other transport from there.
@BlackRocker57 please correct me if I am wrong. Do you have any other ideas?
Hope this helps.