Praise the charging gods, you can actually buy certified third party USB-C to Lightning cables now, which allow you to use USB-C PD chargers to fast-charge modern iPhones from 0% to 50% in under 30 minutes.
Anker was (naturally) one of the first out of the gate with the new cables, and now, you can save $4 on the 6' version. Use promo code ANPL2CL6 to get a 6' PowerLine II cable for just $16. That’s $3 less than Apple charges for the equivalent 3' cable, and Anker’s are more durable, and include a lifetime warranty if it does ever wear out.