Hi, JRR, Welcome to the forum. I am very sorry to hear about your hospital visit, not exactly the way you hope to spend your days on the camino. Hope you are ok and that you were able to finish your Caminho.
Your comment about 8 straight days from Lisbon to Coimbra is a little bit misleading. For one thing, as of May, there is an albergue in Alpriate, which is 20 km from the Lisbon cathedral. So that makes the first day a nice easy starter. As others have pointed out there are places to stay in some of the other non-traditional end points, like Azinhaga and Porto de Muge. And you do have the option of getting the "pick and drop" service from the hospitaleros at Santarem, Alviaizare and Tomar, which is detailed here:
https://www.caminodesantiago.me/community/resources/short-stages-from-lisbon-to-porto.133/.
There's no doubt that the infrastructure on the Lisbon-Porto part has lagged behind, but it is picking up. As the numbers keep increasing, no doubt the facilities will open to respond to the demand.
I agree that asphalt is extremely hard on pilgrim feet. But I do know that the Via Lusitana has been working hard to move pilgrims off the road, and they have had some good success, surely there is more to do, though. Bom Caminho, Laurie