I must admit that I like the idea of back up open sights
Anyway I was thinking about going for maximus suggestion as I liked it, but had another look at the factory sight and made some subtle changes and now I am actually satisfied, I got the post to a nice shape then took of the corners and hand finished it, even though its plastic is so robust and has a smooth solid lever lock up so the factory sight is staying.
I wonder if I will change my mind next week LOL.
Here are the subtle changes
https://imgur.com/9Oq6wer