Lobelia

I'm also currently not selling packages rn, but they will reopen in the future, probably next time I update my world-

I no longer do commissions, sorry

You should be able to just export the fbx from unity if you drop it into your project, and edit it all you want in blender. You can edit it all you want idc, go for it :)

...click on the hips in the left heirarchy, and move the model down slightly, it should move the model down in game as well.

The origin point is off, to fix this click on the model, go to top right, go to Select>Rig>Configure and...

Should be, yes, I have tested it before