@Marcus-UK, I walked the CP this year, and my experience was quite different to this. It has a different feel south of Porto, but I never thought of it as not being 'nice', whatever that might mean. I walked Lisbon-Fatima and then Tomar-Santiago. The waymarking was more than adequate, including the sections from Lisbon to Porto. More, there appeared to be sufficient waymarking of the Fatima routes going south, although clearly I wasn't trying to follow these.
In terms of resources, the forum resources section has GPS tracks and facilities location information on the Portuguese route. I used
this one, which links to the Dutch Society of Saint Jacob resources page. The GPS track information has been updated recently, but the facilities information hasn't been brought up to date for a couple of years, and still has listings of places that closed during COVID-19 and hadn't re-opened when I walked.
Gronze is more up to date here.