I think if it was MY database, I'd take the easy way out and convert all the key values into numbers:
NumKey = 256*(Asc(Mid(AlphKey,1,1))+256*(Asc(Mid(AlphKey,2,1))+256*(Asc(Mid(AlphKey,3,1))+Asc(Mid(AlphKey,4,1)))))+Asc(Mid(AlphKey,5,1))
(The parens may not be right - count'em.)
If the...