From interviews it is clear that whatever replacement there will be for a the P-3 it will be a jet powered aircraft and not turbo prop.
Since P-8s are unlikely for PN, this leaves the in development A319MPA for PN, being a EU aircraft PN can have it customized and since PIA extensively operates and is inducting more A320s it would be easy to maintain.
The A319MPA is still in development (with France, Germany, Turkey as potential clients) was pitched to India as well but they chose the P-8 instead, so the suppliers can not be bullied to not sell to Pakistan.