No. The strategy that Kyoukai contributed was the plan they used in practice. Kyoukai was literally credited for the strategy of conquest of Nanyou, not just some weg "psychological warfare" idea.
Definition of strategy - a plan of action designed to achieve a long-term or overall aim.
This is what Kyoukai brought up to the table according to manga.
Feel free to also familiarise yourself with the definition of tactics. Strategy and tactics are not synomous or interchangeable. The former is the
what, the latter is the
how.
The strategy was to take Nanyou without fighting. The tactic to achieve that was psychological warfare.
The method Tou initially proposed to execute psychological warfare was the use of another 100K army that wouldn't actually fight in the campaign, which can
also be attributed to Kyou Kai as a matter of common sense.
What cannot be attributed to Kyou Kai, unless you have evidence to the contrary, is Tou
pivoting to using non-soldiers as an
alternative method for psychological warfare.
I'll reiterate the part you chose to leave out:
What doesn't make sense is for Tou to lead with a request for resources you suggest he wasn't after in the first place.
If Tou was after non-soldiers all along, he would have simply led with that. If Kyou Kai's suggestion was to use non-soldiers from the beginning, Hara would've shown that either in real time or in a flashback. Instead, only Tou is associated with that specific method.
Tou brought up he needs an army. He didn't say he needs an army of soldiers. When Shouheikun expressed his concerns he simply specified that he means an army of old men.
If one asks the Head of Military affairs for an additional 100K army, it is implicitely understood they are asking for soldiers fit for purpose unless they specifiy otherwise.
I didn't selectively post panels, I provided the pages that clearly show Tou getting turned down on his initial request and then - again -
pivoting to non-soldiers.
If the use of non-soldiers specifically was the plan all along, Tou would've led with that, rather than asking for another 100K soldiers
without specifiying, and
then suggesting non-soldiers as a solution.
There's no evidence you can cite to prove or suggest Kyou Kai's proposal hinged on the use of non-soldiers all along, because it didn't.
Therefore, this characterisation is simply incorrect.
It's not a matter of opinion, it's a fact.
Kyoukai outplayed the entire state of Han with the disguised old men plan.
Kyou Kai shares in the credit for deceiving Han, but not for the use of non-soldiers specifically.