Just an update. While in a lab at Insights I suddenly realized I can call an Epicor Function via REST, I this this really solves everything… I think I can build out a Function that handles all the various method calls, merges, filters and sorts the data and then just return that to the browser for display. Why did I think fumbling with multiple REST calls and all this in JS was the best way… This way seems to be much lighter on the browser and reduces server traffic and puts all the work on the server… where it should be.