if there`ll be demand I don`t see problem with adding one type sets. Also you could send additional instructions in comments field when you`re making purchase. If you ask me to include only clasic t-guns and get permission before buying simply write that during checkout.
edit:
Here are promised unpainted cast pics:
-that`s how basically how it comes straight from the blister. The only thing I`ve removed is the part connecting tip of the barrel and insert.
Casted in polyurethane resin, the one that is often called "liquid plastic" as it has properties similar to PCV (it`s flexible, non-transparent, easy to work with).