With the paid for version of Fusion 360 you can do indexed 4th axis. Another 4th axis option with true rotary toolpaths would be Deskproto - I looked at this but have to admit I haven't used it in anger. https://www.deskproto.com/

But as you don't have a 4th axis (yet!), I guess you will have to go 3 axis and make compromises.