Revit LT does not allow addons unfortunately but I think it is not too much to ask for Revit LT users to get access to the world of Unreal Engine visualization.
Without the plugin, there should either be an export to datasmith in Revit LT features, which is on the Autodesk side, OR an Unreal Engine .rvt import feature based on the cad to datasmith conversion technology. So after importing, it should work on the same updating and re-importing features of the datasmith addon but based on a .rvt file instead.
On the basis of the existing Autodesk - Epic partnership, I believe this would be a great benefit for most of the small independent architects who use Revit LT.