Since the codes for Latin-1 are the same as Unicode for the first 256 values, that should work (you need to re-encode the values but don't need to translate them though a table). That is, if "use utf8" is not in scope when the regex is compiled. I don't know about Perl 5.8, which reportedly doesn't need the utf8 pragma—you might need some other way to refer to those character on the input.
Anyway, you can use the same light-weight trick to convert back. s/([\x{80}-\x{ff}])/pack('C',$1)/eg Compiled with utf8 in effect (note the curlies on the \x codes. This indicates UTF-8 encoded characters). Then use pack instead of chr so you can specify bytes (chr does too much DWIMary and the persuasion thing is not as transparant as one would hope when dealing with I/O, though I think it's behavior in 5.6 would work in this case).
—John
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