Scaling a soda syphon batter recipe.

I want to make a smaller batch of a soda syphon batter recipe as a trial. The batter involves flour, vodka, honey and lager, and is put into a CO2 soda syphon.
The full batch is too much for a trial run (300g of Vodka)

Can I scale it down or does that mess up the working of the syphon?

The full recipe calls for three charges, can I do 1/3 of the batter with one charge? Or do I still use the three charges. I’m not sure of the science here

If you are using a ISI Syphon the valve will automatically release the excess pressure. One cartridge may not be enough to push all the batter out, (not enough gaz pressure for the volume of the vessel) I would do two, try, and if you feel you need more add one more as you go. Remember to sake the syphon energetically for a good 30 sec. This helps the CO2 to blend into the ingredients.
Happy sailing
Cheers