rej,
It's good to see something being done about these. Your solution will obviously work in this case, and reduce permanent notams to just 60 days. So well done on that.
But I wonder why the NOTAMs were ever coded as they were? Would it not have made more sence to put the centre of the NOTAM in the country affected, and a radius sufficient to cover the whole of that country. Then people would only see the NOTAM if their route took them through the airspace affected? Just like other NOTAMs.
dp