Looking for a USB power bank that charges via a built-in folding AC plug and has replaceable 18650 or 21700 cells

Right now I carry both an USB-PD wall charger and also a USB-PD power bank (a Zendure, with non-replaceable batteries). I'd like to replace them with a combination USB-PD power bank and wall charger (like the INIU Multi or Anker Fusion), but with replaceable batteries. Does such a device exist? If it does, I haven't been able to find it.