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Running hydrogen as a supplement is OK - putting too much faith into HHO/Brown gas systems (never scientifically proven), IMO, is a cause for concern. There is more to it than just running hydrogen into the engine - as hydrogen will burn in any ratio of oxygen, gasoline will not. People could read that as hydrogen being the perfect fuel - the problem is how that energy is transferred into work to fuel an ICE.
Anyway - to answer your question - only the pre-catalytic sensor needs to be tricked, as that is the one actively controlling the feedback loop for the air/fuel.
As for a constant 12V source that is automatically switched on with the ignition - I would highly recommend wiring in a separate source. The current draw could be significant and potentially cause problems for those critical systems. Either wire it separately or add in a separate relay keyed on the ignition switch to put power on your cell.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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