Are you *sure* that SVG can't do image maps? This works for me, producing clickable links:

echo 'graph G { 
node [URL="http://search.cpan.org"  ] CPAN;
node [URL="http://www.perlmonks.org"] PerlMonks;
CPAN -- PerlMonks; } ' | dot -Tsvg > PM_573377.svg
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