Sticking on one type and company like Damen or China is not enough ? Or do the US boats offer something better in quality and performance ?
I don't think it matters much with ship designs. Ultimately, the PN will source the core components -- e.g., propulsion, electronics, and weapons -- of all of its ships from one set of vendors. So, as an example, they'll probably use MTU CODAD across all frigates, including both the Type 054A/P and MILGEM, just as they're using the HQ-16 SAMs on both ships, and so on. Logistics isn't as much of an issue with systems as long as you configure them along similar lines.
I think with Swiftships, they seem to want to enter the Pakistani naval and maritime market, see this except as an example:
Karachi Shipyard Engineering Works Ltd has joined hands with USA based ships manufacturer M/s Swiftship for co-production of steel, Aluminium and fibre hull boards for Pakistan Navy, fisheries and commercial sector. The Memorandum of Understanding (MoU) was signed between rear admiral Athar Saleem and Shehraze Shah on the third day of International Defence Exhibition and Seminar (IDEAS)-2018.
https://fp.brecorder.com/2018/11/20181130427471/
So, the idea of Swiftships either selling the design IP of the Swift Corvette to the PN -- or even designing a new corvette for the PN in Pakistan -- is a possibility I think. This is just my guess, but hey, as
@cabatli_53 and
@Tank131 will testify, my guesswork on a lot of things (e.g., MILGEM getting VLS) works out. It's just an issue of, 'is there enough evidence to conclude X is a possibility?' As I see it, the PN is (1) into buying ship designs now (it owns the IP of the Jinnah class frigate) and (2) apparently forming a deeper relationship with Swiftships and Damen Shipyards.
Now, the latter basically made a custom corvette design out of nowhere for the PN (this design isn't even listed on its product portfolio). So, it might be possible that the PN settled on the Damen Shipyards design and, with time, will buy it off so that KSEW (or Gwadar?) can manufacture it in numbers over the next few decades.