1) It's the bend dialogue. Unflanged, single flange, double flanged.

2) The Bend and Trunnion SIFs can be calculated via FEA, like NozzlePro. A SIF goes on the bend and a SIF goes onto the trunnion.

3) The SIF for the tee should be relatively straight forward like any other tee, unless you're aware of any special geometrical differences between it and a standard tee. It's possible that you can use tees instead of elbows with trunnions, but I can't guarantee it's cheaper to purchase and install this than it would be to purchase a license of NozzlePro if you don't have it.