I looked back at some old TF2 screenshots and saw myself using this old mod, however it has long since broke and therefore I decided to re-make (fix) it. All it does is mirror or flip the stickybomb launchers to their other side. Supports everything, including festives. You can choose the Old Sticky Jumper or the Plunger Jumper. Compatible with custom textures, note that the Plunger Jumper has a modified texture to fix shadowing, because I removed the large sign which obstructed a large portion of the view.
I tried this with Paysus's Demo FP Animations remade custom animation mod and it broke half of this mod where firing the stickybomb launcher will still remains static with no animations as in the port doesn't move but when reloading it seems fine. Also can you make an alternate version where it uses the default model where the port stays on the right instead of the left. ScoutThe over there has a point about the botkillers since the model is flip but not the chain of the botkiller which cause the right side of the chain for the botkiller to clip through the chamber where the stickybombs are stored and the left side of the chain to float in mid-air.