@mbartosh, when I was a customer, the AIX OS updates were performed via custom content. I’ve posted your question on my team’s Teams chat, and got the following response from @garyl.
Still not possible. we only deliver SP/TL within the same release.
I guess we could do something custom with NIM
I don’t see any BigFix Ideas (aka RFE) for this topic, so I’d recommend logging one at your convenience.