Posted: 14/10/2015 at 18:13
Not really I'm afraid Daisy.
Obviously I didn't realise there are restrictions on movement, lifting etc for you so you might well be right that a petrol machine could be difficult for you to start. They are often heavier (so more tiring to use) - so an electric one might be right for you.
Stihl do make a cordless electric brush cutter with a blade which might be a good compromise (FSA 90) but it is considerably more than £100 - especially if you have buy the battery & charger separately (haven't looked at it too closely).
The more powerful of the models you originally suggested might well be the most suitable in your particular circumstances.
If you think you will only need to clear the brambles / undergrowth once (and can then keep on top of maintenance) you might find it cheaper to hire a heavy duty brush cutter for a weekend to get that job out of the way and done safely and quickly. If you don't know somebody who would come and do it for you then a professional gardening team would probably come in with their own equipment for a day or so and sort it out for you.
If you have a disability local volunteers might come in to help with clearance. Do you have a local volunteer centre you can contact?
Whether you hire equipment or call in professional help it means you have one (probably not tooooo) expensive outlay to get the initial job done quickly (and some sanity restored for you) and you can then buy a cheaper light weight strimmer to maintain the areas yourself as necessary.
If you have family asking what you would like for Christmas or birthday perhaps they would contribute to a "Garden Clearance" fund if they realised how much it meant to you to put it right.
Difficult to decide what to do but I hope you come up with something. It is horrible watching your garden disappear under weeds etc when your heart is aching to be out there.