Sorry for being quite away from here @
peregrina2000 and @
annakappa, but I've been on vacations, and I'm still not in the "action mode"
Using the Portuguese Postal Service it's out of the list because of two things: it is expensive and it has a limitation for 2kg according to their website. I think that there is a way to send heavier things through postal service, but it's expensive.
There are companies like DHL that could take care of your things, and have them delivered where you want them. I know that there are also Portuguese companies, almost only dedicated to the Caminho that also do that, but I'm still searching. I've posed the question on a Portuguese pilgrims group on Facebook, and I'm waiting for an answer from them.
Best Regards
Diogo