Currently, in order to simulate infinite item storage as if a Creative Vending Upgrade was in effect, a player would have to enable cheats/get OP then do the following:

1. Place a Functional Drawer.
2. Place an item inside.
3. Lock it.
4. Place four Netherite Storage Upgrades inside, raising the total capacity to 2147483647 items.
5. Place a repeating command block set to Always Active on top of the drawer.
6. Set the following command in the command block: data modify block ~ ~-1 ~ handler.BigItems.0.Amount set value 2147483647

If a creative vending upgrade item were to be added, it would allow infinite withdrawal of up to 2147483647 items at once and with unlimited frequency. The workaround described above allows withdrawal of up to 2147483647 items per tick.