Lots of luck indeed indeed, but that's true for every team - even best sides can have a bad day, which happens to be SF or Final - like WI suffered in 1983.
Apart from that, the team & most individuals has to peak at right time - if 2/3 top players raise their game & rest backs up, any team can punch well above their weight; but again this is true for every team.
Things that are at own hand are -
1. Bring down average age to below 29 level, preferably closer to 25. It's 11 matches in 38 days or so - and every tournament is tail heavy, that's you play KO matches at the end, not start. Every key player in current team will be 2 years older, so the clue should be clear where to chop if the average age is to pull down <29
2. A new ball partner for Amir. Not saying JK isn't going to work, but unless he reaches to 2012-13 level, PAK will need to replace him; because he doesn't bat at all & not everyday his other partners will knock 3/4 down by the time ball gets old.
3. A pace bowling all-rounder at 7, who either has to make the team as 4th pacer or no. 6 batsman on individual merit - don't like bits & pieces all rounders, which haven't won Poms or SAF much. Ideally, he should replace Imad.
4. A top class No. 4 - Haris, Amin or a new kid, don't know but this 1970s born MoHa/Malik model won't work.
So, in total it's about 4/5 (depending on fixing tribunal) spots to fix (either by new player or existing one has to improve)
1. Sharjeel (or open spot - Azhar/Shehzad doesn't give confidence)
2. Babar
3. Fakhar
4. Open spot
5. Sarfraz
6. Open spot (May be one of Mian/MoHa can sneak in - but that doesn't help average age. I'll pick Umar - provided he is a changed man)
7. Open spot (Yamin, Fahim has to improve bowling, or new face)
8. Shadab
9. Amir
10. Hasan
11. Open spot (2012-13 equivalent JK can work, otherwise new face)
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12. Back - up opener : open spot (Azhar can stay in squad, but problem is if picked in squad, he'll start, which isn't what is needed, because if he plays, he'll push one of my top 4 to No. 6)
13. Back up WK (Can't risk one WK for 9 confirmed matches, besides Sarfraz is Captain, might get banned sometimes for over rate - had Sarf not been Captain, I would have gone for a middle-order & build Sharjeel for part time keeper, he is decent 1st slip, so should be able to serve at desperate situations) : Umar Akmal - I make lots of fun, but truth is, he is still can be the MVP of this side, offers so much flexibility. Ideally, he should be that Open No. 6, if not No. 4. PAK can't leave hope or such a player just at 29-30, who can serve duel purpose (back up middle order)
14. Back up spinner - Imad
15. Back up pacer - presents JK is fine for back up. If he regresses, PAK will need a back up pacer. May be Sameen Gul, whose bowling style should fit new ball bowling in U.K.
If 16th player is allowed, it should be the 2nd all-rounder - may be MoHa, if ICC is happy with his action - but problem again is, if in squad, he'll find his way to starting XI - an idea I hate to visualize - MoHa in his 40s trying to master fast bowlers in UK, in June. I would like to pick one of Aga Salman, Talat, Saud Shakil or some new kid from U19 team (there is a U19 WC in 6 months' time - 14 months before 2019 WC, might find a top class kid to develop in a year, through that revised draft domestic system��