I have a mod that adds books to the game with the codes for every item in the game so that I can spawn things into my inventory. As you can imagine getting up and typing on the keyboard is quite inconvenient I am wondering if there are any controller friendly mods that would allow me to spawn items into my inventory, perhaps a UI would pop up and you could select from different catagories, then the letter it starts with, then select the item and how many you want. If not would it be possible to do and how hard would it be?

well there's tons of things you can do.

the easiest is probably just to make a bunch of bat files though.
like lets say i have a bat file called firewood that has the console command for +1 firewood

Then I would be able type bat firewood into the console to get +1 firewood.
or you could make an MCM menu or any other number of scripts/menus, etc to do the same thing.