Any luck with 3-rd party USB-C to Lightning cables?
I did try https://www.amazon.com/gp/product/B06XCGXTQ4/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
Metrans cable with OEM Apple 29W brick ... didn't work.
From 1% to 26% n 48 minutes with locked screen.
Haven't tried any yet... but I would think any cable that would work would probably need to be thicker to handle the increased power load. That might be a good indicator - if it's as thin as a USB-A to Lightning cable, it probably won't work or if it does, it probably isn't safe to use.
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