Cutting hedge technology

There's a big hedge at our place, long and deep, going around the main parts of the garden.   It's a bitch to trim, and I've been doing nothing but that for the last three days.  It's finished now.  Next trim - Autumn.

I have a fair amont of kit to help with the job: a scaffolding set with wheels, and three hedge trimmers: a mains-electric-powered one with a long pole, one battery-powered and one 2-stroke.   The 2-stroke one is heavy, loud and smelly but powerful, the battery one is quieter and lighter but weak.  The electric long pole is heavy, quiet and powerful and necessary for cutting across the top of the hedge.

I'm thinking that it might be time to combine the benefits of lightness and power and get a small, mains-electric-powered trimmer.   It's the lightest you can get since the trimmer only houses the motor and not the fuel as well, and a mains -powered 600Watt one should be powerful enough, quiet and light.  The mains cable won't be a problem because it'll be out and in use anyway for the long throw one, and I'm getting tired of coming in smelling of 2-stroke fumes, or breathing them in, come to that.

I have thought about the possibility that a small tractor with hedge trimmer would be a good idea.  I'd really love to be able to drive it along the two sides of the hedge, trimming as I go.  The job would be done in an hour max, but it's not actually possible to do that - there are trees, shrubs and piles of firewood in the way.   That ground is also far from level, so I'd end up with an undulating top to the hedge, something that I try to avoid.

You can see part of the finished hedge in the pic below.  I used to be a bit more fastidious about getting it straight, flat and horizontal but these days I'm just up for taming the beast.   I left the trimming so late one year that the hedge flopped over a gap in it, so I'm trying to make an arched tunnel.  It's early days, but it looks like it will come to fruition in a few years.  And who doesn't like spooky tunnels?