This would be a nice addition. I get worried I’ll be banned from uploads if i keep reuploading the same file just to see how it looks.
But If you have an android device you can use a file editor and replace a head file with your new head just by deleting a random head file you own and pasting your head file then naming it to whatever head file you deleted. This is a local change so its only client side but it lets you test out swords body's shields heads etc.
If you’d like a step by step feel free to PM me in game and ill walk you through it.