It's a whole lot easier now. If you look under the stern, you can see a small wooden stand that keeps the boat from tipping back as I walk aft of the trailer wheels.
I just run a line from the fore-stay through the bow plate to the mast. Then I can release the fore stay from the bottle screw, and it's held at the mast. Once I am ready to drop the mast I release the line holding the forestay and just ease it back.
No more A Frame and pulleys.
I'm not at all sure I will be able to do this in 20 years time, but it's good for now.