I fail to see why a constructive 2-level canapé opening should not be deemed natural. As written now, from what I can tell, it´s not.
Say 2H = 11-15 4H & 5+C or 2S = 12-15, 4M & 5+m (either).
I'd suggest that a 2-level opening bid with 4-cards ...
Bidding/leading forums are IMO not just a theorethical excercise. They should also give the reader some enjoyment and sense of gratification.
While the actual table result may detract from the discussion, it's also another way for the reader to get redemption for a low score on the problem ...
Many moons ago (mid 90's) I had:
Imps, same start, 3H (pass)?
My LHO had represented Sweden and RHO was a multiple national winner.
I tried 4C and bought it in 4H making.
In this situation it seemed better to fake strength with a non ...