The text on both cards says, "When you reveal a maneuver..."

Does that mean "when you flip over your movement dial" or would modifying your initial maneuver with one of these cards count as revealing a maneuver again?

If so, Han with C3P0, Stay on Target and Navigator would be a nightmare.

Being extensively discussed here

http://community.fantasyflightgames.com/index.php?/topic/112026-stay-on-target-preview/

And, effectively, here

http://community.fantasyflightgames.com/index.php?/topic/112040-boba-fett-and-stay-on-target/

Right now it works. Expect FFG to errata/FAQ SOT to turn all maneuvers red and not allow navigator to make it a non-red maneuver, if they don't recognize the problem before the cards are printed and fix it.