This mode makes it possible to exchange streamstones (warrior or hero) for other ones. You can get 1 streamstone using 8 streamstones. I think it is the most reasonable number. However, if you want to hunt easier, there are two optional files (2-1 or 4-1) here. It is definitely cheat mod so USE AT OWN YOUR RISK.

[SHOULD READ]
When you talk with Maka, you can exchange your streamstones. But there were some heavy problems (many many bugs), so I could not add new slots for streamstones. Therefore, I changed some slots of materials to streamstones. This is the list of changed slots. Sorry about this...

Rathian Spike --- Warrior's Streamstone: Sword
Rathian Spike + --- Warrior's Streamstone: Blade
Radobaan Marrow --- Warrior's Streamstone: Hammer
Radobaan Medulla --- Warrior's Streamstone: Lance
Rathalos Marrow --- Warrior's Streamstone: Axe
Rathalos Medulla --- Warrior's Streamstone: Shaft
Diablos Marrow --- Warrior's Streamstone: Ranged
Diablos Medulla --- Hero's Streamstone: Sword
Uragaan Marrow --- Hero's Streamstone: Blade
Bazelgeuse Fuse --- Hero's Streamstone: Hammer
Lightcrystal --- Hero's Streamstone: Lance
Novacrystal --- Hero's Streamstone: Axe
Firecell Stone --- Hero's Streamstone: Shaft
Dragonbone Relic --- Hero's Streamstone: Ranged
Elder Dragon Blood --- Voucher (It needs 100 research points and empty phial)

In addition, Harvest event item is disappeared in Maka. I do not know why...

If you look at images uploaded, you can understand it right away. It was tested in 154766. Please report to me if bugs occurred. Thanks, have a nice hunt!

[INSTALL]
...\Steam\steamapps\common\Monster Hunter World\nativePC\common\maka\maka_exchange.mkex
...\Steam\steamapps\common\Monster Hunter World\nativePC\common\maka\maka_item.mkit

[UNINSTALL]
remove above files.