Lol do i need show you its is possible

without editing exe and other just look closer to item and shopset thats all you can put in this shop all what you want.
I don't have old screen but i put to shop NPC Love and all works perfect.
If you want you can put there even item from D-shop
Look closer in files itemetc.csv column named PurchasePoint (o **** there is a price for PP PurchasePoint)
Then look what that item and BOOM look at shopset.csv for correct index and change this index on another or just add new item in shopset (Love or any shop you like) set the price in itemetc item weapon or what you want.
Just look:
And one more thing if you add some item in shopset increase TotalCount row for more item if don't do this item not show in shop
Sample: