Sorry for he delay. I was out for a few days.
The KE4 S at 22 degrees loft is more more in the middle from a loft standpoint, giving you a 2.5 degree gap from the 699U and the TS2 5 iron. the other two could work too, but hard to know exactly what the gapping would be. The TS2 #4 could work but would be only 1.5 degrees weaker than the 3U. That may not matter because of the other characteristics of the club and how they effect how far you hit it. the gapping may be fine even at that lesser loft difference. I really like the FDI Tour (use the #3 and the #4 myself), but the #4 at 23 degrees is only one degree stronger than the TS2 #5 iron. Maybe the FDI #3 at 21 degrees could be an option. It really is kind of a guess as to which combination would fill the proper gap you need, but if we go just by the loft, the KE4 S is the one with the better loft progression. I would not count out the FDI as an option. I really like mine. I carry the #3 and the #4 and play the TS1 #5-PW.