I want to be able to use my 1/4” bits with the precision drivers I have. I’ve looked locally but couldn’t find such a...

Super easy. Barely an inconvenience. I’ve done replacements on earpads myself a few times, on some ATH M50x and older Bose wired sets. One of my requirements for any headphone I buy is the ability to replace the pads for when I inevitably wear them out since they will probably go before the electronics do. I would give you some links to videos of how to or pages to buy replacements, but here’s the search I did. It’s all a gold mine for your purposes. https://www.google.com/search?q=qc35+ear...-8