How about just tr'ing the initial Base64 ID like so:
$id =~ tr|+/=|___|;
# or
$id =~ tr|+/=|000|;
You would lose just a few bits of randomness (acceptable in this application), but would be left with a shorter ID that's an easy match with a /\w/.
MeowChow
s aamecha.s a..a\u$&owag.print
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