Just thinking out loud here...
Being the cheapskate that I am I can't imagine spending $40-50 a piece for several varigrinds to tack weld them into one angle each when it is pretty easy to make single angle ones with construction similar to the Ellsworth jig, but with the geometry you want.
I know that your time is worth something, but if we are talking about several of them you are starting to get some more efficiency in the making of them. If I were making four or five, given the price of the varigrind, I'd be getting a decent hourly return for my time.