Can I do the Camino Portogues (Coastal Route) in 10 days & Weather

There is good public transport and a commuter rail line running north out of Porto along the coast, so you could plan to fly to Porto and start somewhere like Viana do Castelo.

If you haven't spent much time in Portugal or Spain, it's nice to have some energy and time in your day to explore the town you're staying in each day, as well as a buffer at the start of your trip (especially if you're coming from a different time zone) and at the end of your trip (there is plenty to see in Santiago). You might also look into the sunrise and sunset times.

As for bedbugs, just go prepared to put your pack and contents in a dryer in case you do see signs of them.