Many, Many times! In the 2.0 days there was a real shortage of kickers to recruit, and Sim was all over them from the start! I found out that Punters translated very well to the conversion, with minimal hit to cores for the position change. And by making the change day one, he started improving day one as well.
I also found that as amazing as this sounds, IF you had a QB that had strength, but no onther core worth recruiting for the QB position, you could convert them early as well! They however take WE hits normally, so they are more of a risk.
I have continued my recruiting P for K now under 3.0, although I have found that more recruits seem to have been added, and therefore giving recruiting a true Kicker a tiny bit easier. Hope that helps.