To add these items to your NWN2 character you can use the in-game console, the Silverwand Item Summoner, or purchase from the Silverwand Magical Emporium.

To add an item with the console giveitem command or the Silverwand Item Summoner you will need to know the item's tag, which is the part of the file name preceding ".UTI". After subscribing navigate to the appropriate sub folder in C:\Program Files (x86)\Steam\steamapps\workshop\content\2738630
If you look at the contents you can see which files are UTI files. If there is documentation you should read it,

Using the console giveitem command will disable achievements, so to reenable achievements save the game and then edit the file globals.xml in the saved game folder, changing the 1 to 0 (zero) in these lines (credit to Aldroen):
<Booleans>
<Boolean>
<Name>ShowCheatsWarning</Name>
<Value>1</Value>
</Boolean>
<Boolean>
<Name>Cheater</Name>
<Value>1</Value>
</Boolean>
</Booleans>

The Silverwand Magical Emporium Collection has been set up so that people who want to download all of the SIlverwand created items can do so by subscribing to that collection.

In my opinion you should merge all these item mods into a single mod and make a list of them. Spreading them out like this probably discourages players from downloading so many items and makes it harder for you to update and keep a track of them all.