Would it be legal at Level 4 to play a Prepared Club System that has the options
(i) natural clubs or
(ii) some form of NT or
(iii) weak both majors 4/4 7-11 high card points.
The first two are fine and much played, subject to minimum point counts, rule of 18 etc. But the third options seems to violate both laws 7A3 (must be 8+) and 7B1 (not strong enough and doesn't promise either of the minors).