Carrier Screen or Valiant Stand could work for SA'a. It looks like Oyashio accompanied several carriers and attacked Washington during the battle of Guadalcanal. And either of them would be new for Japan (I think, I haven't checked)
Just one of these seems better to me, both is trying to do two things at once. Plus any torp SA with LL is enough to bump the cost and carrier screen is not an insignificant ability. The history on this tips it more offensively, what with it's torp attacks. I'd leave the carrier ability for another unit down the line.
"That's right son, join the navy. Get behind a bloody big gun and knock the hell out of somebody"
"We went out, got our arses kicked, then came back again"
I had it in my mind for Kasumi to do something like this when we shortlisted units. She escorted just about every ship type including fleet carriers before her 'death ride' with Yamato. Could still be a future option.
"That's right son, join the navy. Get behind a bloody big gun and knock the hell out of somebody"
"We went out, got our arses kicked, then came back again"
I would prefer just valiant stand—synergistic (or at least complementary) SAs are better IMO, since both have to be paid for, but often only one of the two will be used
University Student— Lover of Plato, Aristotle, War At Sea, Palestrina, and Mozart