Hi,
It seems that currently there's no way to initialize the SG Review programmatically.
Based on Michael Kessler suggestion you can do a hack:
commands.sendInternalEvent( "external-sgtk-launch-app", '{"server":"https://example.shotgunstudio.com", "app":"none"}')
But as he told me this will throw an error:
ERROR: sgtk_rv_bootstrap don't know how to launch app 'none'.
It could be possible to fix that in order to accept a "none" app?
Thanks.