I don't remember the details of how I did this, but this was necessary for a module I published years ago to CPAN, Test::MonitorSites. A review of that code will likely turn up some useful clues.
UPDATE:
OK, this seems to be the code which did the trick:
my $Test = Test::Builder->new;
my @handle_names = qw/ output failure_output todo_output /;
my %old;
$old{$_} = $Test->$_ for @handle_names;
$Test->$_(\*STDOUT) for @handle_names;
# which was restored like so . . .
$Test->todo_output(*STDOUT);
$Test->failure_output(*STDERR);
$Test->output(*STDOUT);
-- Hugh
if( $lal && $lol ) { $life++; }
if( $insurance->rationing() ) { $people->die(); }
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