I really don't understand why the XTEINK X4 Pro doesn't have a built-in USB-C port. A good part of the appeal of a device like that is less lock-in, but then you're stuck with a proprietary connector.
I guess this makes it a bit thinner and maybe a larger battery? I'd much rather have a slightly larger/thicker device and built-in USB-C.
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The "original" XTEINK X4 (not pro) has a USB-C port - that's explicitly why I bought it. It looks like it is out of production now. The good news is they are a proven, very popular device (it's just an e-ink display glued to an ESP32 with good third party support) so this class of device should be available on AliExpress soon if not already.