Feel you’d have to be a pretty zealous TNG fan to be offended by that, and I can’t imagine any such fan wouldn’t have seen DS9 already. Also, TNG fans generally eat up anything that eludes to Picard’s time as a Borg, so they’d probably love his scenes.
Maybe "A Man Alone" would be a better choice, it efficiently introduces Odo and also the way some people see him plus it really sets the tone of the series.