Just a quick unorganized guide for @George_The_Penguin
(Could work with exact numbers of items such as 97 bait if you use block code. Shouldn’t be too hard)
Place these devices
Property Settings
Inventory Item Manager Settings
No changes to trigger. The trigger is just how you activate the system. You can choose to have it activated by being stepped on, by wire, or by channel.
Checker Settings
1st Item Granter Settings
2nd Item Granter Settings
Trigger Wire
Triggered → Run Check
Short Checker Wire
Check Passes → Grant Item
Long Checker Wire
Check Fails → Grant Item
To make it account for more items duplicate the whole thing except the trigger and change the settings and properties to match the new item.
The problem with this simple solution is if you have 100 bait, you will only receive back the amount you set the item granter to grant. This system bests works with gadgets and consumables since you never have many of them!
If you need help just ask! 
