Currently, we are kicking off from the 30yd line. Move the line scrimmage to kick from back to the 25 line (if you want to make onsides matter to the kicking team). I do like the idea of Tbs starting on the 15yd. The fair catch rule, currently, is only on the first bounce you can wave for it (the one college was caught on the high bounce).
Another thought, what about widening (or shortening) the space between teams to 20yds (I know, "safety risks").
Last thought (Church league softball rule), can only kick 3 onsides a game. I do feel like this one is a little extreme; however, Everyone has a level playing field at that point, and the teams that have been T-ing off on the weaker opponents because "they can't kick far
", will to figure it out. 
Those same teams tend to make a lot of PAT kicks....I'm sure everyone would be fine.
Another thought, what about widening (or shortening) the space between teams to 20yds (I know, "safety risks").
Last thought (Church league softball rule), can only kick 3 onsides a game. I do feel like this one is a little extreme; however, Everyone has a level playing field at that point, and the teams that have been T-ing off on the weaker opponents because "they can't kick far
", will to figure it out. Those same teams tend to make a lot of PAT kicks....I'm sure everyone would be fine.