Unlike your examples above EUC's don't have any gear, so there is no elephant in the room. The only way to increase speed is with voltage, we have no cogs to help*.
https://www.theengineeringchoice.com/what-is-gear-ratio-and-how-to-calculate-a-gear-ratio/#:~:text=It seems that the gear,this is a simple calculation.
https://www.kmpdrivetrain.com/final-drive/why-change-your-final-drive/#:~:text=A lower (taller) gear ratio,CWP) or ring and pinion.
*yet (is it even worth the hassle to try)