This was going to be my approach as well but I chickened out. I felt fine about drilling the massive fender hole but between the air bag and virtually zero chance of reversing the A-pillar holes, I wanted to explore other options.

I read about several Tacoma guys using double sided 3M vehicle adhesive for the A pillar. I'm trialing this right now and so far after a few hundred miles it's working okay. I've been watching the snorkel frequently and haven't noticed any movement at freeway speeds.

I'm not sure I can personally recommend it (yet) but others have tried it and seems to be working just fine. With the number of fasteners holding the snorkel on, I don't think it'll fly off. Worst case I'm imagining is it'll loosen/rattle and I'll have to take the fender liner off again to tighten the hardware.