I think, I'll take the top 7, including Umar at 7, instead of Imad. That protects Sarfraz a bit, because at 6 & as last specialist bat (& Captain) he often puts too much pressure on him. He is quite capable to score 23 of 18 at 6, which'll be perfect, if Umar bats at 7 (& delivers). Imad is not likely to do much with ball, therefore it's Imad vs Umar as batsman & I'll pick Umar.
However, the pace bowling attack is a bit weak - Wahab is always a risk on this off day & there is no back up pacer. In that regard, I'll actually play Yamin at 7 & take a pacer who can use the new ball with Amir - may be Sohail, or a new face Sameen or Adil (Ehsan). For squad, Fakhar should be considered, because he is in great touch & bowling as well, though not sure how much he can do in UK with his bottom hand technique - in moving condition, you need top hand players, but this guy grips the bat almost at it's root (low est point of handle) & use the bat like axe, ala Ijaz. One of Umar or Kamran has to be taken, because PAK doesn't have any other batsman (without Asad & Rizwan in squad) who can keep.
My 16 will be
MoHa, Amin
Babar, Haris, Malik, Sarfraz
Yamin, Shadab
Sohail, Amir, Hasan,
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Imad, Sameen, Umar, Fakhar, Talat
Talat misses out if it's 15 men squad,while they might take any new pacer (May be, that tall guy from LQ), but not Wahab. In June, he doesn't have any role in UK.