Both openers turned down central contracts last year in favour of the franchise circuit and both illustrated why their services would be in demand around the world.
Seifert made another rapid start while monopolising the strike and collecting runs in boundaries, smacking four sixes before being dismissed for 44 from 22 balls.
Allen then took over and followed his partner’s lead, reaching his half-century from only 19 deliveries as the Black Caps raced to 134-2 at the halfway mark.
Seeming set to challenge for a record score, three quick wickets somewhat halted the home side’s charge, falling to 149-5 before Bracewell (46no off 26) ensured the innings would finish on a high.
The final tally was New Zealand’s eighth-highest in T20 cricket and, thanks to their pace trio, would prove to be more than enough.
Jacob Duffy (4-20) and Will O’Rourke (1-29) all but ended the chances of a successful chase inside the first two overs, reducing the tourists 9-3 while dismissing Hasan Nawaz – a centurion in Friday night’s win at Eden Park – for one.
Zak Foulkes (3-25) then got in on the action as nine Pakistani batters were dismissed for single figures, eventually bowled out for 105 in the 17th over.
Following victories by nine and five wickets in the series’ first two matches, the comprehensive result ensured Wednesday night’s finale in Wellington would be a dead rubber.
The two teams will then play a three-match ODI series starting in Napier on Saturday.