Not ideal, but good enough.
Succefully performed master strikes with longsword (bastard sword) and shield (timecodes):
02:04
03:13
03:30
03:50
04:03
04:58
05:12
05:22
05:34
05:42
07:48
07:53
08:02
08:06
08:10
other people also say
Too bad for “other ppl” if they play KC:D and cannot do it a year later after release 
PS On casual ezmode matrix-like slomo and in softcore with shield indicator enabled it’s even easier to perform. This video recorded in Hardcore mode.