Ireland replied with 233-3 off 37.4 overs, Porterfield top-scoring with 101 and Morgan adding 61.
"The decision was crucial and cost us the game, " said Porterfield shortly after Friday's defeat.
Gary Wilson was next best with 46 while fellow opener William Porterfield added 32 as Ireland posted 285-4.
Porterfield and Stirling set about their target with relish, Syed Rasel shipping 14 off the second over the innings.
Irish captain William Porterfield, the Gloucestershire batsman, cited a key area for improvement.
The Gloucestershire total was built on a sparkling second-wicket stand of 116 in 16 overs between Porterfield and Marshall.
Bracewell has lost Somerset-bound duo Steve Kirby and Gemaal Hussain, Anthony Ireland to Middlesex and Will Porterfield to Warwickshire.
Mark Porterfield, Pimco's spokesman, didn't reply to email and voice messages seeking comments.
Set 307 to win, Stirling (101) and William Porterfield (68) produced an opening stand of 177 from 162 balls.
Porterfield was angered by a reviewed decision to give Gary Wilson out lbw in Friday's 44-run defeat in Mohali.
They include the German Reinhard Fabisch, Dutchman Clemens Westerhof and England's Iain Porterfield.
William Porterfield scored 84, Niall O'Brien 64 not out and Eoin Morgan 42 as Ireland scored 214-3 off 45 overs.
He and captain Porterfield raced to 81-0 in the mandatory 10-over powerplay as Stirling reached his fifty off 25 balls.
Morgan fell with the score at 88, before Porterfield and O'Brien put on a partnership of 101 for the third wicket.
The club, based in Ghana's second city Kumasi, had also hired former Zambia coach Ian Porterfield and ex-Ghana manager Ralf Zumdick.
Ireland replied with 188-1 off 42.3 overs, aided by a score of 104 not out off 133 balls by William Porterfield.
"We came to South Africa to win this tournament, not just qualify for the World Cup, " said delighted Ireland skipper Porterfield afterwards.
Intruding on the story to interview his characters as they go about their business, Porterfield draws their suppressed turmoil to the foreground.
Cusack was next in and rightly sought to give Porterfield the strike.
Porterfield had laboured somewhat for his 23, and pushed a catch back to Abdur Razzak, then Mortaza returned to remove Gary Wilson.
Will Porterfield and Niall O'Brian put on 59 but Lasith Malinga (2-19), Ajantha Mendis (2-22) and Muttiah Muralitharan (1-13) then took over.
Anderson - under pressure after conceding 163 runs in the first two matches - had Will Porterfield bowled off an inside edge.
Durham had no answer to a massive Gloucester total of 301-8, sculpted by Chris Taylor (71), William Porterfield (68) and Hamish Marshall (56).
Porterfield and Wilson put on 68 for the first wicket and despite four dismissals, the unbeaten Irish were never under any serious pressure.
Both men continued to pepper the boundary, with Porterfield smashing Shakib for six over long-on, as the score reached an imposing 69-0 after 10 overs.
"We thought about the timing of the campaign and knew that just before the England and India games would generate the most publicity, " said Porterfield.
"The replays showed Wilson was trying to play a shot and that could be seen on the big screen (on the ground) as well, " added Porterfield.
Irish skipper Trent Johnston won the toss and elected to bat first but he must have been worried when openers William Porterfield and Eoin Morgan fell cheaply.
BBC: SPORT | Cricket | International Teams | Botha stars as Ireland beat Scots
Skipper William Porterfield led the way with a funky cut and dye, while coach Phil Simmons had his head shaved and is also sporting a blue goatee.
The Irish bowled out Uganda for 155 and Gary Wilson's 61 and 44 from William Porterfield helped Phil Simmons' side reach their target in the 41st over.
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