It's not easy to bat against a good bowling machine ftr.
Ok then, hypothetical. Let's assume Afghanistan pick Rashid Khan in a warm-up Chairman's XI because he's short on overs. They instruct him only to bowl his leg break, so that the opposition's best specialist batsman doesn't get the chance to see the googly ahead of time.
None of the things you pose are necessarily better than practice against a decent XI in more or less the correct conditions, they all have problems with resourcing and that's ignoring the fact that, for example, replicated 'away' pitches will behave differently in a different climate, coaching can only do so much, and getting players to play overseas doesn't always yield the desired results, like Pujara this year, and rather concedes the point that practice in the correct conditions against the correct sort of opposition is vital. This also ignores the way the modern game is played, with players playing less FC cricket due to T20 (and central contracting even) and also changes in techniques. One can only play so much cricket, and since only money puts bread on the table most players will forgo the more nuanced things you bring up in favour of leagues, thus making tour matches even more important, and turning out a decent opposition isn't really altruism, it was the standard for 140 years. If you look back to the time when Australia was less fazed by overseas conditions you'll also see top flight players playing more FC cricket, and more tour matches against full strength or nearly full strength sides. If we look back really far, back to when JBMAC was a little tyke or earlier, we can see that Australia could come over from flat, faster wickets to soft damp English ones and actually play themselves in and acclimatise against strong opposition to very alien conditions without having any of the resources you describe, and compete in and sometimes even win test series. We could ask about boards who don't have the resources like WI or NZ, are they supposed to go to the dogs? When experienced ex-players like Rahul Dravid opine that there may be a problem, there may be a problem.
Firstly you've deliberately posed your hypothetical scenario so you know it's one you can win, it's unlikely a board would not only play a layer in a non-regular match against the touring team and tell them to not bowl properly rather than having them play a domestic match around the same time, and so on. But even then facing said player would give the opposition some clues about them which is obviously better than none, for instance getting them used to his regular release which could make the variation more obvious, or noting his stock line and length and making plans to disrupt that which can disrupt their ability to deliver their variation effectively. And there are very few true mystery players like Rashid, so it doesn't apply to most scenarios. It's too narrow a framing.
It'd be better if teams took responsibility for their away form, rather than trying to blame a whole host of other factors outside their control (I'm mainly talking about the coach here). We get the 'they're not giving us ideal warm-up scenarios' and 'they're doctoring their pitches' and we even got 'coin tosses are unfair and should be abolished' from one side a couple of years ago on the sub-continent.
What happens when a team gets scheduled a tour match like this though and they just say at the last minute "nah **** it we aren't wasting our time" and just organise an intra-squad game against proper spin bowler? Would they even be allowed to? Hard to organise your own proper preparation if you're obligated to play practice games against doctored 'A' teams.
Uh what?. Do you even understand what the thread is about or what the issue with the game was? Because even though it was very clear you still clearly don't. And why are you posting about it?
I'm more leaning toward what a few suggested earlier regarding touring teams being in more in charge of their own warm-up. But they'd have to communicate with the hosting board so they aren't stuck playing useless tour games (assuming they are useless). One of the major issues has been strength of tour match opposition being sub-par, which is a tough one to solve, and no one is doing it deliberately (afaik).
