I've been trying this for a while since I'm trying to get a 3 stock kill combo . . . still no luck.
Best I could get for 3 bar is here
Whether the first rdp.d replaced with an ex one in the second combo would push the second combo up high enough I really doubt. I probably should've finished that video.
Clearly you could throw in that much, much harder link before hd too so you are at one less hit and you have a heavy damage but I'd never pull that off in a match so don't care for it