Re: There's one TEENSY problem…
There are dozens if not hundreds of cable manufacturers who have MFI certified Lightning cables. Friendly Swede, Anker, Belkin (as you mention), TekNet, Syncwire, and Amazon Basics are just the ones off the first couple of pages on Amazon. Even BelayCords are MFI certified and they're a Kickstarter and have reversible USB plugs too.