So, after a long while I finally decided to make me one, and I must say I should have done it very long ago.
Here is the instructions:
You will need this app to mount flash drives:
I have tried a USB mouse, keyboard and flash drive. The mouse is a bit buggy, the keyboard works perfectly and the flash drive also works 100%.
Be sure to apply this fix to get the USB host mode going on the S7 Slim: