Based on your request, it sounds like you are looking for a Datapack that allows you to combine any item in Minecraft (often called "Minecraft But You Can Combine Any Item").
Downloading and installing a datapack is relatively straightforward. Here's a step-by-step guide: minecraft but you can combine any item download datapack top
Attribute Stacking: Combine a Sword with a Feather for "Reach" or "Speed." Based on your request, it sounds like you
What is a Datapack?