I believe Acidmods offers the chips pre-programmed. This is the best route for you i think.... They are asking 8$ a chip give or take... and to use a serial programmer on XP is a decent sized pain in the ass. If you only want to make this one mod.... They are offering an invaluable service to sale the chip at 8$.
https://acidmods.com/ShopUSA/product_info.php?products_id=81