I think these Sorceresses could easily be a Faction, but the developers need to study the designs of Factions from Jadama and create something decent, not just a copy of the Ashan dungeon.
I think it would be very difficult to use a battering ram as a combat unit. If we're going to have machines and not ballistas, then they should be simple scorpions.
If we add a little imagination (scorpions are operated by cool mage-priests, they feed on faith and shoot righteous light, for reference – like the enchanted ballista of the Tier 5 Elves), then they could even be used for high-level units.
Here, I would say that there are too many things that resemble Tier 3 Kriggan. But, as the same source said, not all Kriggan units were actually Kriggan, and the same Ifrits could be returned to Inferno in the classic style, especially since they were traditionally a cool unit, fast and with a fun fire shield mechanic (and on the new engine, they could even be casters). They would replace the Jagged Ones.
I like Ifrits, but I couldn't figure out how well they would fit into the lineup, considering that we agreed to keep elements of the insectoid style. And I'm more inclined to replace them with a poisonous creature. I also imagined it as a sorcerer.
Instead of Imps, you could try to create something very weak and very numerous, so that even the model is small and unimpressive. Flies, larvae, mosquitoes... But, as you rightly said, without extra limbs and growths, with a concise design. Give them the largest number among the Tier 1 units, cheap stats (1-2 HP, for example), and let them swarm. Various skills that give +1 HP to a unit and the like will be super effective, and with certain upgrades, this tier will be a force.
Although Gobots and the lizard faction in general had a problem that they didn't fit well into the setting, so they were removed in the following parts. But since we're going with insectoids...
Overall – amazing ideas, I really want the developers to read this, throw away a bunch of useless developments, and do it exactly like this. I support these ideas, it's exactly what I want to see. I especially liked the ideas of sea giants, hydras in the sea faction, and liches on Tier 7 (liches are traditionally the highest and most powerful undead, which in many settings are also difficult to kill due to phylacteries, it was correctly noted that in Heroes they are not given absolute power).
(but liches are still Tier 6 for me, I haven't decided to move them higher than dead dragons, although swapping them and putting them on Tier 7 doesn't sound that bad)
🏹🎪+⛓️♿=💕

