^Pretty sure that'll work. In my last playthrough I kept to mostly paragon choices, but chose almost exclusively renegade dialogue options. It made for some very interesting scenes.
And the renegade choices for Legion's loyalty mesh much better with the paragon choice, IMHO.
The whole "they're not human, don't judge them by our values" schtick seems to lead more naturally to wanting to reprogram the Heretics than "branwashing is teh bads, you're dope, Legion"
That, and pure paragon dialogue on Mordin's loyalty makes me feel like an idiot.