This would be fine, if fat chocobos and goobbues can fly as fast as dragons and griffins i have no issues with a chocobo speed magitek motorcycle, honestly Clouds bike isn't outside of the lore at all, ffxiv is pretty advanced.
Besides.. guardian corps uniform + the glorious new spiked hairstyle my female hyur can finally use + the epic swooshing noise Blazefire saber makes (gun mode for mch please) needs a bike to complete the look.