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I would go with a Dremel type tool. I purchased an Aldi version with a flexible shaft which was great until the flexible shaft packed in. Then realised it was just as easy to work without the flexible shaft.
So IMO don't bust a gut trying to get a tool with all the fittings, just the motorised unit and you will be fine. The little grinding wheels don't last long so you will need some of them at the ready.
Sod removing the blades, that's a faff just to sharpen it. If you want to check the spacers haven't cracked just slacken the nut and pry the blades apart. Are you talking about polishing the spacers? Unless anyone doing it has a pair of verniers and knows how to use them they're likely to do more harm than good.
Variable speed is unnecessary and counter productive in this application. These blades are a bog standard tool steel. You're not going to exceed the SFM for grinding this with a B&Q grinder and disc. If you slow it down, all that's likely to happen is the operator wobbles whilst waiting for the cut to complete and ends up rounding off.
You might be on to something with the belt grinder (I presume you mean file belt grinder), if you can fit it between the teeth. What might also work is a fibre sanding disc without the backing pad.
All that said....a staff member can make a decent job in under an hour with a new fresh file. :D
Ah, I get you. Not sure I'd bother but each to their own. It would be a good way of removing any burrs from sharpening.
I've always used an angle grinder...... about 5 "strokes" on each cutting edge does the trick and the double-sides cutter takes about 15 minutes. I was given a Dremel a few months ago.................. tried it on the hedgecutter blades but found it rather tricky to use.... the "wheel" didn't seem to be at the ideal angle and not nearly as quick and simple as the anglegrinder. Don't let other people frighten you about using a grinder!!.....it really is very easy to do and there's no need to separate the blades....... just don't do too many "strokes" at a time as you don't want to heat the blade up. I clamp the hedgecutter in a vertical position in the jaws of my old "workmate". Obviously, you have to start the cutter up to get the blades in the right position. position. I use the narrow cutting disc rather than the wider grinding disc.......... it's easier to use.
Don't need to wait for it to turn brown, if it isn't cutting cleanly it isn't sharp, easy to inspect the the cut hedge and seee.