2 questions about high school football

[jTheUmp]

Is there a limit on the number of times a team can decline the illegal procedure penalty one the kickoff when the kicking team is intentionally kicking out of bounds?

I'm not sure what you mean. If a free kick goes out of bounds untouched by R, R has three choices:
1) 5 yard penalty, rekick.
2) put the ball in play 25 yards beyond the previous spot. (normally R's 35 yard line).
3) put the ball in play at the out-of-bounds spot. (declining the penalty)

So you can decline the penalty every time K kicks out of bounds, but you're only going to get the chance to do that once per kick.

If a turnover occurs on a two point conversion can the defensive team return the ball for two points?

No. The ball is dead on a try once Team B gains possession.