hmmm...I think we're talking about 2 different things.
1. There's the twin-engine tender for an LRMPA
2. Germany approved the sale of a 'torpedo-fighter-plane' to Pakistan.
I'm saying No. 2 is referring to another RAS-72, that's the only 'torpedo-plane' program we have with Germany.
The twin-engine jet for the LRMPA is a separate program, likely to be designed, integrated and tested in Pakistan. I agree with you, the PN is clearly looking for a larger plane. However, I don't think they'll get A220. Unfortunately, it is too late for that and now that plane is in Airbus' hands. When it was still with Bombardier, maybe...
That said, the Bombardier Global 6000 or 7500 are a good bet. They're slightly lighter than the MTOW requirement, but we know (from the Saab Swordfish) that turning it into an LRMPA is doable. Moreover, Canada is evidently fine with countries using the jet for military purposes, even Turkey's using it for the HAVASOJ EW/ECM aircraft.
The PN will likely go the Bombardier route, either brand new from factory or through third-party companies.
But if we follow the tender requirements to the letter, then it boils down to the Airbus A220-100 or the Embraer Lineage 1000E. Yes, Boeing bought Embraer's airliner division, but the Lineage 1000E actually belongs to Embraer's VIP line (which Embraer still owns).