What is the easiest way to plan accommodation options while en route?
Haven't you already answered your own question?
But seriously, it looks like you have plenty of tools to figure out accommodations for your tour. And the thing about the Pacific Coast is that there are few places where there are a scarcity of lodging options. And if you have the ACA map, it'll warn you about them.
Camping is dead easy on the Pacific Coast, with a couple exceptions (noted on the ACA maps). Since the majority of places you stay at will be state run hiker-biker sites, you don't need to think much about them. They'll always be available to you, no reservations needed. Just look at the maps. Other map apps and google maps are useful, but if you are strictly staying on the route, superfluous. (They
would come in handy if you decided to do considerable detours off the main route.)
Indoor lodging would be trickier. There are a decent amount of hotels and motels on the route, but if you are going in the high season, many will be booked up. That's when you can use google maps and other searches to book them a day or two in advance. If you plan on doing this, I'd recommend getting a North American cell phone number when you get State-side. Some of these places won't have online booking options, so you'll need to be able to call them (and possibly leave a message if you hit them at the time they close the office to clean, run to town to do errands, etc.)
But I wouldn't sweat these things too much. It's easy to overthink things before hitting the road. Many people have biked the Pacific Coast with less tools, and have come out fine.
