Yea, but the bigger problem is not the one how to do it, but how to balance it.
Considering the fact that your army capacity is limited, the difficulty of a camp does not scale linearly, because the more meatshield you take, the fewer space for the damage units you have.
Realistically doubling enemy stats/numbers would most likely result in increasing the losses about 4 times, and in some cases make camps undefeatable using units (and quite possibly there would be some camps undefeatable using debuffs aswell).
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In case someone missed it, the initial iteration of Alibaba adventures on PTR had Steermen at 1 million HP, and if I remember correctly there was at least one camp where there were only about 5-10 unit combinations total (out of possible hundreds of thousands) that could defeat the camp without sending tens of MMAs to kill the weaker units. Sounds difficult enough, and thats just a result of pumping one units HP up too much. Nevermind the damage.