What's the laptop? It looks like someone makes a handful of adapters for different laptop barrel connectors to USB c PD.

Using multiple ports isn't really an option, because all the ground (0v) lines on a USB power Bank will be tied together, so stacking them would only prove to short+V to Gnd. If you had multiple power banks, and did not tie the chassis lines together (because those are also often shorted to 0V), maybe this would work it likely depends on the adapters used, but that would involve you traveling with a power strip, 4 adapters and the monster cable.