FWIW Akram only bowled as a change bowler in 3 Tests (to be fair, he did average 14). Best change (pace) bowlers (by average) in 25+ innings are:Red Hill made a point re choosing a Garner or Akram because they were accostomed to coming in 1st change and better old ball bowlers and more adept at taking lower order wickets.
20.36: Pat Cummins (80 wickets)
21.69: Joel Garner (132)
21.89: Shaun Pollock (59)
22.75: Stuart Clark (66)
23.07: Michael Holding (78)
23.26: Angus Fraser (71)
23.75: Mike Hendrick (45)
23.80: Malcolm Marshall (113)
24.66: Mohammed Shami (77)
25.14: Kagiso Rabada (85)
25.63: Dominic Cork (63)
25.84: Ian Botham (177)
26.48: Merv Hughes (99)
26.51: Courtney Walsh (192)
26.71: Jason Gillespie (46)
Just for comparison, best opening bowlers (since WW1) are:
18.86: Mohammad Abbas (66)
19.25: Alan Davidson (170)
19.48: Colin Croft (74)
19.71: Malcolm Marshall (263)
20.21: Kagiso Rabada (98)
20.22: Joel Garner (127)
20.77: Shane Bond (86)
20.83: Ian Bishop (108)
20.91: Bill Bowes (62)
21.10: Neil Adcock (104)
21.15: Curtly Ambrose (376)
21.34: Glen McGrath (541)
21.57: Fred Trueman (307)
21.84: Vernon Philander (214)
21.90: Imran Khan (347)