Perhaps. This is what was in my mind
There's hypothetical statement that Hun is actually Xiongnu that is driven west by China...
If so, I think it'll be better if they start at near Mongolia and going west time over time.. which makes me concern if they clash with Tocharians...
But I learn that if I want Huns to start near Mongolia, then Turks should start at near Kazakhstan too!
So well.. spawning them north of Danube might be a good idea

But then, they have to be barbarian, not any other else.. because it'll be odd that there's ancient Romanian state there that survive to modern era
But we should make sure that they disappear by certain era so they won't imbalance the upcoming German and Russian nation
Tocharian..
I think they should spawn at Bactria instead at around 2000 or 1500 BC?
Then there's independent Samarqand at 700BC so by then we have already at least 2 city, Bactria and Samarqand..
Zoroastrianism should be founded in Bactria and therefore it solves the Shiraz as Zoroastrianism Holy City issue... Still Achaemenid should still prefer Zoroastrianism than any other religion.. to around 90% percentage
Probably this Oxus civilization might found Merv and Kashgar so there'll probably cities Samarkand, Kashgar, Merv, Bactria, and Dunhuang. If lucky there might be Bukhara as well
If they fail the Mongol conquest at 1200s, sometime later they should respawn as Shaybanids in 1500s with Samarkand as the capital
