Back when I was half my age, I taught a few thousand people CPR, FA, AFA, and WFA. Agreed, Red Cross 8- to 16-hour courses can be quite tedious and focus exclusively on what to do while dialing 911. The Red Cross standard "Advanced First Aid" also doesn't go very far, very fast. It plods along further by virtue of being 50 hours long (say, 2 hours, twice a week, for 12 weeks).
Several things I liked about the WFA course we did: We required a basic level of FA knowledge and didn't rehash that info. We did our course in parallel with a standard AFA course and made it clear that WFA was harder and involved more reading so all the people who just wanted the minimum AFA certificate for Ski Patrol or Life Guarding didn't take our course – that was important because with a smart, motivated class, you can go further. There were serious backpackers, transoceanic sailors, concerned Scoutmasters, and most of them were there because they'd already seen some things happen and wanted to be better prepared. We did lots of practicals – two or three every class and 3 additional multi-hour sessions with fake blood, make-up, screaming "victims" with scripts, and having rescuers bring their backpack as it would be on an actual trip (so your splint isn't a splint, it's a thermarest plus backpack stays, etc). Things we did wrong at first: too much theory, too much anatomy.
A little outside the box, but you could ask multiple Red Cross chapters for the name of their instructor who would be best qualified to teach Wilderness First Aid. Especially if you put together a few like-minded friends, maybe they'd do a custom class. Not through the Chapter and not issuing a certificate, but taking you as far as you wanted to go regarding the issues most of concern to you. I've done custom courses for groups – pumping up the extended-care aspects or exposure to toxics, or whatever their risks were.