Fortunately the way towards Braga was easy to find on maps, but I found it difficult to get proper information about it. As this situation still continues, I sorted my pieces of information to encourage others to follow these arrows.
To take this path means your are off the mayor routes, but don't consider it totally empty. I was told about 1000 pilgrims take this route per year. The pilgrims office in Santiago counted 594 pilgrims who started 2018 in Braga, while they told 13841 pilgrims did the coastal variant.
The waymarking is good, but this way has a a little problem with accomodation.
The first pilgrim shelter in Santiago de Antas is at km 37! A bit much, do you aggree?
Taking the Metro to the outskirts of Porto will cut off 6-7km, which still makes a long day.
If someone knows about accomodation in Vila do Coronado or São Romão, please let us know!