I too have thought about that but felt nervous about incompatible materials, welding heat shrink differential, resulting stress and my neighbor down the block getting a schrapnel wound.

I want to do it make a serious leaf blower out of my zero-turn.

Or to do even more aggressive 'mow-tilling' (i do it now using old blades to flatten out all those pesky mole hills in my back field)
I'd add a bit down-ward to 'lower' the blades for a better buzz-cut.