Oops, interface implementations on Program don't carry over into the compiled game script. IConsoleProgram will have to just stand as a compile-time checking convenience.

AirMonitor/AirZone.cs

@@ -38,7 +38,7 @@ namespace IngameScript
 
             public List<IMyAirVent> Vents { get; } = new List<IMyAirVent>();
 
-            private IConsoleProgram _program;
+            private Program _program;
 
             // private List<IMyTextSurface> _displays = new List<IMyTextSurface>(); // TODO: add single-zone displays
             private List<IMyLightingBlock> _lights = new List<IMyLightingBlock>();
@@ -48,7 +48,7 @@ namespace IngameScript
 
             private const float TriggerLevel = 0.75F;
 
-            public AirZone(IConsoleProgram program, string zoneName)
+            public AirZone(Program program, string zoneName)
             {
                 Name = zoneName;
                 _program = program;

Airlock/Airlock.cs

@@ -86,7 +86,7 @@ namespace IngameScript
             private const int CooldownTicks = 12;
             private const int SealTimeoutTicks = 30;
 
-            public Airlock(string name, IConsoleProgram _program)
+            public Airlock(string name, Program _program)
             {
                 _ini = _program.Ini;
                 _name = name;
@@ -121,7 +121,8 @@ namespace IngameScript
             // Precondition: _ini.TryParse() should be called on the block before calling this function.
             private void addVent(IMyAirVent vent)
             {
-                if (_airVent == null) {
+                if (_airVent == null)
+                {
                     _airVent = vent;
                     return;
                 }

Mixins/Console/Console.cs

@@ -23,11 +23,6 @@ namespace IngameScript
         // Properties that should be defined by the implementer.
         MyIni Ini { get; }
         Program.IConsole Console { get; }
-
-        // Inherited properties that we need access to
-        IMyGridProgramRuntimeInfo Runtime { get; }
-        IMyProgrammableBlock Me { get; }
-        Action<string> Echo { get; }
     }
 
     partial class Program
@@ -46,13 +41,13 @@ namespace IngameScript
             private List<string> _buffer = new List<string>();
             private StringBuilder _builder = new StringBuilder();
             private int _tickCount = 0;
-            private IConsoleProgram _program;
+            private Program _program;
             private string _programName;
             private int _maxLines = 10;
 
             private const int DefaultMaxLines = 10;
 
-            public MainConsole(IConsoleProgram program, string programName)
+            public MainConsole(Program program, string programName)
             {
                 _program = program;
                 _programName = programName;