As I mentioned elsewhere, my own iMac is boxed up to be buffed up when I get the courage to open it up (probably more dangerous to my computer’s life than living in Georgia today might be to my own DNA-derived existence, but that’s another story).
Assuming that your efforts to re-create the Fusion between SSD and rotating platter into a logical single volume with smart management of frequently used data, I tried to find out:
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Whether you actually could format that SSD as a single separate volume mountable on the Mac desktop, perhaps containing the system, perhaps used for data
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Just how large would that independent volume be?
The answers were:
I don’t know (partly because my iMac is boxed up)
and
The answer is available, at (of all places) TidBits, to wit: