Just read this entire thread. Thanks so much to the OP and all who added to it! It was so informative. Obviously, some time has passed since the original post but all the info still seems to apply.
As an FYI - I ordered my ANC bypass from Crutchfield (for my 2020 RAM 2500). It was $9.99 + shipping and as a bonus I got the free "install guide/build sheet" for my specific vehicle to boot. I will be doing a simple upgrade later, just speaker replacement and a powered sub so I figured I'd get the ANC taken care of first. I'm curios to see what, if any, difference I can detect from the stock setup once disabled.