Strictures are lexically scoped, so if you turn them off in a small block, you are pretty safe.

This particular example happens in a small foreach loop, so there's your block. If you're in the middle of a longer sequence, you can say

do_stuff();
{ no strict 'refs';
    printf "%s=%d\n", $_, &{"DBI::$_"};
}
do_more_stuff();
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