I have not read the whole thread. But perhaps this is close (if you can depend on the 'divide' delimiter):
New Table( "Convert Char Fraction",
 Add Rows( 4 ),
 New Column( "Char Fraction",
 Character,
 "Nominal",
 Set Values( {"4 / 5", "3/2", "27/     26", "122       /37.6"} )
 ),
 New Column( "Result",
 Numeric,
 "Continuous",
 Format( "Fixed Dec", 12, 3 ),
 Formula(
 Num( Trim( Word( 1, :Char Fraction, "/" ) ) ) /
 Num( Trim( Word( 2, :Char Fraction, "/" ) ) )
 )
 )
);