This is actually not dissimilar to my line of thinking. With so many Cyclone/Vacuum effects in the game now, it doesn’t feel like too much of an ask.
The whole reason I loved Sweeping Wind in Diablo 3 was because I could Cyclone Strike everything into it. Without this interaction it’s just not as fun. Basically this set feels like it should play like a Hurricane Barb.
2 Piece - Sweeping Wind gains the effect of every Rune,
4 Piece - Gain 1% Movement Speed and Damage Reduction for 10 seconds each time Sweeping Wind hits an enemy. Stacks 50 times.
6 Piece - Every second Tempest Rush causes a Cyclone Strike that increases the radius of Sweeping Wind by 1 yard for every enemy hit (upto 24 yards). Tempest Rush, Sweeping Wind and Cyclone Strike damage increased by 10,000%.
All 3 are thematically wind related. Cyclone Strike has no damage buffing legendaries (that buffs Cyclone Strike damage that is, not other things) so isn’t significantly powerful on it’s own, mostly included for flavor. Tempest Rush has a couple and would help complete the damage profile of the set.
Won’t ever happen, but we can dream.