Like I said, there is no chance of uplifting anyone. As far as I can tell, there is no chance of bringing back Araby to its state before it was ruined by Settra without spending a century on it. Last turn, we struggled to do what we thought we needed to do. Last turn does not look like we did everything we want but the nerf bat is coming anyway. Now that I know the nerf is coming and what we can expect from Araby and Norsca, we should not have done anything.
This seems unecessarily confrontational. If something is prohibitively difficult to do, then don't do it? Araby is hard hit, Medes is less hard hit, the Land of Assassins is even less hard hit. I did indeed give you a maximalist option to try and push back the desert, plant trees, sort rivers out and so on, but you could also simply say you wanted to move the Arabyans into the Land of Assassins. Migrations occour all the time, they're not unusual in history. You can start there, set up roads and railways pretty easily, establish technical schools and quite rapidly get up to Steam and Steel levels of technology.
One thing, as an example, that you got out of your battles, has been hundreds of high qualtiy recruits, another is the saftey of the Land of Assassins more broadly. Another is the defeat of the Djinncallers. They needed to be destroyed because the Imperium woulnd't have tolerated them, and yes they were an entrenched community of daemonologists and pskyers, that's going to be costly to fight, and it was.
No you can't have everything you want all the time, that would be ridiculous. You got almost everything, you got the fuel, you got the genetorium, you got the Norscan bastion.
You can also look to other ways of doing things. Next economy turn for example you could set up autogun production and make thousands of them. Yes, a random person from Mallus will be less effective than a Space Marine, but they'll still be very effective, and thousands and thousands of them will be even more effective.
Send the PDF in instead. Establish roads going from place to place, put a autogun factory in solland and issue guns there, retake the mountains and forests, push out, do whatever. There's lots you can do. You have the 'rebuild the pharosian guard' action there too, you could use them fine as well, there'll be 10,000 of them. Yes, an intense deployment of Thunderhawks over several years is expensive, they can go into space, they're immune to most missile weapons, they could ram a dragon if they wanted lol. They have smart bombs and missiles and so on. They're an expensive way of doing things.
This all requires discussion, yes stuff can be difficult but you don't need to just say 'oh we can accomplish nothing theres no reason to try'.