I've played with mattresses a bunch. What you are doing is counter productive but there isn't much else you can do. Adding stiffness over softness doesn't make sense. Many foam mattresses whether memory or latex are built up using a combination of types and pound ratings. It's actually a complex equation to fit a mattress to the sleeper and few people can do it right. That doesn't mean you can't.
I had a Tempurpedic after making a foam assembly of my own. Mine was better and I was sorry I spent the money. I had stopped at a motel when I went up to San Jose to buy the Carrera I had and they featured Tempurpedic. I thought I was sold. It did wear out. You won't like this but I sleep on a Sleep Number. However, I have added 2 additional layers to the SN. This is exactly what they do in order to 'sell up' your purchase but they don't offer any particular combinations, just more stuff and at least one of those added layers is foam. In my case, and knowing through experimenting for 20 years, I actually made a SN into quite a nice bed.
Back to your Temp: first of all examine the construction and understand what is there. Ideally your new 'insert' would go somewhere in the middle but that would be next to impossible. If I was there with you, I might flip the entire mattress upside down and add something to the bottom which is now the top. If that worked, you could cut it in half and flip the one side back over right. Additionally, you possibly could get all of your mattress back into the original cover not needing any sewing. One might be higher than the other.
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Originally Posted by ossiblue
How about just opening the existing mattress cover, carefully along a side seam, and have a zipper installed. Then, you can open the cover and install whatever stiffener might work on your side only, try it out, and replace/substitute, until you find the ideal firmness.
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IIRC, there is a zipper around 270º of the mattress already.
This is an interesting thread and I'm subscribed. I'll add in going forth as I think this out more.