There's one slight problem with adding stability to older ships - it was told in Galnet, even before the first 'new' ship came out, that 'sco tears apart our ships and we need to design new ones'. Since this became a part of lore, it would be difficult to explain new bulkheads after all this time. This also means bulk alloy is not making sco unstable, it's the ships' 'design', whatever that means (Frame? Structure? Thermal capability?). Otherwise stable sco could be achieved with different bulkheads.
I don't think fdev should invest time into breaking older ships, and by breaking I mean rebalancing, because that would be done to all of the existing builds for no reason. If they make stable sco as a module, they need to explain this in lore, which I don't see happening. I still would not use additional module and waste a slot, even if that was done. I'd like fdev to focus on making new things that are broken on release to be... not broken. And QoL stuff, which they are doing little by little.