I'll just say this:
AEB-L
14C28N
Niolox
MagnaCut
But also, why does it have to be stainless? What will you do? Chop and baton under the sea?
CPM-3V would be perfectly acceptable. I have uncoated 3V knife for years now, and I'm yet to have any issues with rust.
While S35VN is not a bad steel and is fairly tough for stainless, it'd not be my choice for a blade of such size.
So, I get it, they wanted to please the "stainless guys".
And they also wanted a powder steel to call it super steel so they can charge more.
And S35VN was readily available for decent price, while still being tough for stainless.
They also boast about edge retention, while I don't think primary concern of guys buying blades such as BK-2 and ESEE 6 is how long will they keep push cutting paper.
I kinda understand that at thickness and geometry of BK-2 almost anything is going to be tough (sharpened prybar) so S35VN kinda gets a pass there, but ESEE-6 style knife is full flat grind.
I've also seen guys with regular carbon RAT7 and even 5 complain on chipping in various Facebook group.
I've also seen guys posting pics of SP-1 bent in the handle and my SP-53 broke at the handle (there is a hole in the middle of the stick tang, and that's where it snapped).
IDK how will that steel hold up at that geometry and how good will their HT be. But, this is hard pass for me.