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Well, the history of Russia doesn't quite fit into that theory – your theory involves the spirit of a djinn and a demon, but in the history of Russia, the spirit of the djinn was absorbed by a mage, not a demon.
In general, if we don't deviate from the lore, we can do it like this: the description that the developers made should remain for the regular ifrit, and the upgraded and alternate versions should be described in this style:
"Unit Name" - these are ifrits that (describe what happened to them - they leveled up/were influenced, etc.)
Added 3 minutes ago
That is, we are not being too specific or providing excessive information; we are not going against the lore, but rather supplementing it with something that does not contradict it (at least, it doesn't contradict what is known).
Added 9 minutes ago
Here is some more information from the wiki:
http://ru.mightandmagic.wikia.com/wiki/Джинны_(Асхан)
There is also information about ifrits at the end.
... И древний лес, роскошен и печален, Блистает там воздушностью прогалин. Но между кедров, полных тишиной, Расщелина по склону ниспадала. О, никогда под бледною луной Так пышен не был тот уют лесной...