I don't know if it's worth buying a special tool for all you would need to use it as this cost next to nothing to make.
Unless you are a fork specialist working on them all the time, maybe then it would be a good idea.
I have used this one about 3 times in about 5 years on my bike and a mates.
Then again some folk have to have all the gear...

Ah if its going to cost a lot to get the proper thing then its not worth it, it's the fact that I dont have a welder or know someone that has one.
I'll get the bits and see if a garage will weld the bolt on for me.