OK buzzyb, in the absence of an answer to my question, I would suggest you replace your conifers with a lovely mixed hedge on native species. Nobody should moan about that and you can keep it as high or low as you wish and it will be wonderful for wildlife. It will be like a block of flats for the birds. Here is a link to give you some ideas of the plants to use. Just make sure you give them all a bucket of water a week each in the summer or when it's dry, for the first couple of years until it gets established.
http://www.botanica.org.uk/HedgingCommon.htm
BTW, it sounds to me as if you are being bullied, that is why I asked you who has told you that you can't replace your trees.