Wrapper around a bank

an alternative would be to extend your wrapper type and define Type constants (or global if you want):

Type herobank Extends BankWrap
	Const HP:Int=0
	Const MANA:Int=1
	
	Method getByte:Byte(idx:Int)
		If idx>=layout_arr.length Then RuntimeError "Invalid Index"
		Return bank.PeekByte(get_offset(idx))
	EndMethod
	Method getDouble:Double(idx:Int)
		If idx>=layout_arr.length Then RuntimeError "Invalid Index"
		Return bank.PeekDouble(get_offset(idx))
	EndMethod
	Method getFloat:Float(idx:Int)
		If idx>=layout_arr.length Then RuntimeError "Invalid Index"
		Return bank.PeekFloat(get_offset(idx))
	EndMethod
	Method getInt:Int(idx:Int)
		If idx>=layout_arr.length Then RuntimeError "Invalid Index"
		Return bank.PeekInt(get_offset(idx))
	EndMethod
	Method getLong:Long(idx:Int)
		If idx>=layout_arr.length Then RuntimeError "Invalid Index"
		Return bank.PeekLong(get_offset(idx))
	EndMethod
	Method getShort:Short(idx:Int)
		If idx>=layout_arr.length Then RuntimeError "Invalid Index"
		Return bank.PeekShort(get_offset(idx))
	EndMethod
	
	Method setByte(idx:Int,val:Byte)
		If idx>=layout_arr.length Then RuntimeError "Invalid Index"
		bank.PokeByte(get_offset(idx),val)		
	EndMethod
	Method setDouble(idx:Int,val:Double)
		If idx>=layout_arr.length Then RuntimeError "Invalid Index"
		bank.PokeDouble(get_offset(idx),val)		
	EndMethod
	Method setFloat(idx:Int,val:Float)
		If idx>=layout_arr.length Then RuntimeError "Invalid Index"
		bank.PokeFloat(get_offset(idx),val)		
	EndMethod
	Method setInt(idx:Int,val:Int)
		If idx>=layout_arr.length Then RuntimeError "Invalid Index"
		bank.PokeInt(get_offset(idx),val)		
	EndMethod
	Method setLong(idx:Int,val:Long)
		If idx>=layout_arr.length Then RuntimeError "Invalid Index"
		bank.PokeLong(get_offset(idx),val)		
	EndMethod
	Method setShort(idx:Int,val:Short)
		If idx>=layout_arr.length Then RuntimeError "Invalid Index"
		bank.PokeShort(get_offset(idx),val)		
	EndMethod
	
EndType

your calls then look something like:

save.setInt(herobank.HP,23)
save.setInt(herobank.MANA,150)
...
Local hero_hp:Int=save.getInt(herobank.HP)
Local hero_mana:Int=save.getInt(herobank.MANA)