Hashes have no problem with combining marks.
$ perl -MData::Dumper -E'
$Data::Dumper::Useqq = 1;
$_ = "e\x{301}";
$h{$_} = 1;
say $h{$_} || 0;
'
1
The problem is probably that the character appears both in composed and decomposed form.
$ perl -E'
$Data::Dumper::Useqq = 1;
$a = "e\x{301}";
$b = "\xE9";
$h{$a} = 1;
say $h{$b} || 0;
'
0
You can use Unicode::Normalize's NFC or NFD to normalize the form. (Doesn't matter which, as long as you're consistent.)
$ perl -MUnicode::Normalize=NFC -E'
$Data::Dumper::Useqq = 1;
$a = NFC("e\x{301}");
$b = NFC("\xE9");
$h{$a} = 1;
say $h{$b} || 0;
'
1
I'm kinda guessing here since you used 20 lines of code to describe a problem that could be described with 2.
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