Looking for carb tablets that dissolve in water for mid-run fuelling

During long runs I use my own carb drink mix (easier to digest than getting all my carbs from gels), but refuelling my soft flask mid-run or race with a sachet of powder always gets messy. It would be easier just to have a tablet that I can drop into my flask, like electrolyte tabs, but with a dose of carbs. I haven’t found any carb drink mix tablets on the market.

Does anyone know if this exists, or had anyone run into this same frustration? Curious if I am missing something here.