A/C evaporator access?

The truck is 6 years old and Toyota A/C Power Foam kit is 3 or 4 years old already. I still haven't figured it out how to foam the evaporator... Do it on my old Swede 2-3 times a year with little to no effort, via evaporator temperature sensor. Contrary, for Tundra there's very little info to be found on the Net. A few drain tube access pics I'm able to find belong to a colonoscopy procedure manual. I definitely would not able to sneak Toyota's foamer hose over there. The next best thing I can find, it requires drilling a hole in the evaporator/heater core box???

Toyota, really? No A/C afterblow function (dries evaporator in 15-45 minutes after shutting the engine off), no easy access to evaporator either. I wouldn't last million miles with that musty smell.