i have made fixtures that locate parts on compound angles by 3-d machining the proper angles on my fixture with the machine i plan to use and then using a tooling ball for future reference pick up.
depending on the shape and size of the part this has worked well in the past.
tricky using fixture agian, so set up good references to align and pick up fixture for next time. ( edges to tram straight and hole or ball to pick up)
the more effort i put into a set up the better the job goes.