There should be a screen filter inside the fuel tank.
The mesh size of the screen is smaller than the diameter of the main jet so in theory if i goes through the screen it will go through the main jet.
In theory.
As for fitting another finer filter go for it.
Again, in theory you could run a mile of tube from the tank to the carb, just as long as the carb is lower than the outlet of the fuel tank.
So you can run the fuel line anywhere to find a convienent place to put your filter.
All that will happen is the volume of the fuel line & filter will become a dead sump of fuel that can not get used once the tank is empty.