but you're wrong in saying that __DATA__ can't be accessed twice
This is not what I said. I said that you can only have one __DATA__ section (per package/file), not that you can only read it once.
The OP asked "how to use multiple sets of __DATA__", which I understood to mean something like this (also see the OP's sample code)
#!/usr/bin/perl
while (<DATA>) { print }
__DATA__
set 1
...
__DATA__
set 2
...
which obviously acts as only one DATA section:
$ ./887252.pl
set 1
...
__DATA__
set 2
...
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