Surely this can't be too difficult, once upon a time I could have probably coded it myself, but basically retrieve the relevant NOTAMS, have it recognise any Lat and Longs and then pin pointing it on a map and any others within a certain number of Characters. This shouldn't be terribly difficult for anyone with an up-to-date knowledge of coding and the desire to put it together.
That is the easy part. The tricky thing is to read all the associated human-readable text to work out what they mean. It's not often the list of lat/lon pairs are just drawing a simple polygon. You need to understand the context of the information.
If the format rarely changes, like sigmets, then you can make assumptions on what they mean. This is how OzRunways, AvPlan and SkyVector draw sigmets presumably. But notams vary widely. The best you could hope for is a tool that recognises the points on a map and allow you to see the points and make up your own mind what they all mean or how to connect them. Even then, something like "10nm north of 12S 123E" wouldn't show up.
The only real solution is a clean sheet look at notams for the 21st century. Good luck with that.