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Ultimately, I do believe mass bionics will be the way to go when it comes to merging the legions as long as we can maintain Lucius vast wealth to afford it.
Through bionics, the physical differences between Acillians and Astartes won't matter we can just upgrade both of them with limbs and forms that are superior even to them. Astartes bionics have been stated to be better than actual astartes limbs in the Iron Hands novel and that's the entire Iron Hands shtick, which our legion will take to an even greater extreme as Techmarines. (we might even ending up selling superior bionics to the Iron Hands legion and the Iron Warriors because obvioulsy both of them would be interested for different reasons)
Then any doctrinal or tactical differences can be handled through training and hypnomat.
It would be the simplest way to mesh our two legions together, rather than trying to tweak more into the genetics. Not to mention since our legion loves their oxygen burning gas, we can make their bodies resistant to the flame gas so they can wade through the stuff without harm. We might not be the Death Guard when it comes to resilience, but damn will we get close with bodies mostly of steel and those few organs not replacable protected behind armorgass.
