you’re right. so i’ve just booked a courier to take my rucksack from Lisbon to Porto and i will travel very light with a small back and a couple of belongings until then. i will post how the service when it’s completed with the name of the company because it was very reasonable and hopefully useful for others.
i spoke with a really helpful lady on the pilgrim helpline. since covid the number of pilgrims has diminished and fewer pilgrims means the luggage transfers are way more costly. i received a reply from taxitemplarios at which point i had already booked a courier but the costs would have been prohibitive for me anyway.