No, what I claim, first, is that you cannot know for certain what is the nature, in detail, of suffering that goes on during this potential aeon for dead unbelievers and how God values it. You claim that certainty.
To me this is the most likely scenario (if universalism is true):
We know that evil people were already suffering when they were alive. Evil people suffer too, you know. They are not living happy, light-hearted, contented lives. All those verses you talk about regarding suffering for evil can be applied for them when they were alive.
And when they die, they, potentially, enter into God’s fire for (limited but long) aeon.
What is the ultimate purpose of that activity? To change them so they can enter Heaven.
So, it is quite logical to assume that during that aeon they are starting to change, starting to repent, starting to weep for everything they have done. And they are doing a lot of those. Those are all good works in the sight of God. And they are suffering as they are going through this transformation. And the more they were evil when alive, the more they are repenting and suffering under realization what they have done.
And by the way, Jesus paid for sins of the world. If universalism is true, “the world” includes all evil people in fire for aeon. Which means that they are not suffering penalty for their sins, since that’s been paid by Jesus. (Don’t talk about Jesus paying only the “death” part, while they are paying the “torture” part of punishment for sins.) They are suffering in realization what have they done, how evil they were when alive. That kind of suffering, which includes repenting, is logical kind of suffering in this scenario, because it leads to change, grows love in them towards God and prepares them for Heaven.
And that kind of suffering God values.
Finally, when aeon is done and they are ready to enter Heaven, something similar or exactly as explained in 1 Corinthians 9 can be applied.
I would add to this that only blind or proud person will say that above scenario is not possible if dead unbelievers are thrown in fire for aeon within universalist view.
Ironically, from the beginning I am saying that this is how I see, as far as God allows me to see. It’s my interpretation. You deny that what you say is an interpretation, which makes you, in effect, a professing prophet of God. And which is a reason why I won’t be arguing with you anymore…