Recommend Between some Schengen member countries' border, build frontier Inspection Station

Recommend current Schengen member countries, according to the level of economic development, break up Schengen member countries as two district. One will be Schengen A area, the other will be Schengen B area.

Between Schengen A area member countries and Schengen B area member countries (or non-Schengen member countries), will build frontier Inspection Station.
For example:
If a person leave one Schengen B area member country to a Schengen A area member country (or a non-Schengen member country), should be accepted frontier Inspection. (whether through land, ferry or airplane)
If a person leave one Schengen A area member country to a Schengen B area member country (or a non-Schengen member country), should be accepted frontier Inspection. (whether through land, ferry or airplane)

If a non-Schengen member country's citizen have effective Schengen A area country's visa, can be free visa to entry any Schengen B area country. But if a non-Schengen member country's citizen have effective Schengen B area country's visa, and not have a effective Schengen A area country's visa, can't be free visa to entry Schengen A area country. (Unless the non-Schengen member country's citizen allow to be free visa to entry Schengen A area country.)

Schengen A area member countries:
Germany ,France ,Netherlands ,Belgium ,Luxembourg ,Austria ,Liechtenstein ,Denmark ,Norway ,Switzerland ,Finland ,Sweden ,Ireland

Schengen B area member countries:
Czech Republic ,Slovakia ,Hungary ,Poland ,Italy ,Spain ,Portugal ,Estonia ,Latvia ,Lithuania ,Slovenia ,Croatia

Recommend Greece ,Malta ,Iceland exit Schengen Area.

Recommend Ireland & Croatia join Schengen Area.