There are lots of magnetic charging adaptors on Amazon and eBay which come with USB-C, Micro-USB, and Lightning tips, all of which share a common interface with their cables. Most of them seem to come from the same manufacturers; there are about three styles, and while no style is interchangeable with another, it's usually not hard to find a variety of sellers for whichever style you want.

Don't expect much in data support even from cables that claim to offer it, but they all deliver power just fine, and it's been getting on for a decade since I've had to screw around with finding the right cable to charge anything. Saves insertion cycles on the connector end, too.