46/36 was aimed at gravel riders with 200-300+ watts of power. Shimano realized not everyone met that criteria hence
the GRX series with 46/31 and 48/32 cranks for those of us with more modest capabilities. Haven't looked at BCD
but most of us would fiddle with the cassette to get the range desired between 31t and 36t cranks. Chainwheels are
probably around for chainwheels between 31-32 and 36 t but you have to go to specialty (and frequently $$) makers
to find them.