I did some work on it, the sie file thingy, still lots to go though.

Turning the swedish parts of utf-8 into PC8 (cp437)  with javascript:

<script>
retval='"ÅÄÖåäö" ';
document.write('I want ' + retval + ' encoded in pc8  = ');
retval = retval.replace(/Å/g, '&#x8f;').replace(/Ä/g,'&#x8e;').replace(/Ö/g,  '&#x99;').replace(/å/g,'&#x86;').replace(/ä/g,'&#x84;').replace(/ö/g,'&#x94;');
document.write(retval +  '');
</script>