If I have missed this in the tread excuse me. Builder, I have the impression that you want a tool that will trim the vertical sides of tall hedges, cut field areas and banks. Has the effective cutting capacity of the mowers we are talking been addressed? I think of the 6' height hedges I have been around as having 1/2"+ woody material that would need to be trimmed for the manicured look. Will a vertically cutting sickle mower do that effectively? It sounds like there are repairs on a regular basis when cutting material beyond the intended purpose of these mower, which was hay. Ditch and pond bank weed mowing sounds normal to me but heavy hedge in a vertical position has me wondering.
MarkV