To bring some perspective into this: according to the appstore statistics, Quickly iOS has about 600 users currently (and only 1.8k downloads ever, including later uninstalls).
That's almost nothing compared to the >50k users of Monal iOS.
While there are a hand full of solutions (local users donating a Sim with SMS flat + cheap android device to route through SMS for their country for example), I fully understand
@nprofile1q... here: according to the user count it doesn't seem worth the effort.