Imac 27 late 2012 EFI update missing original Fusion Drive

I would love to upgrade my loyal IMac2012 27" but I dont have the original fusion drive, I have currently an OCW Aura SSD .
Any recomandation on a workaround since the plan B would be to open the mac and install temporarly a fusion if I can find one!) but I am afraid the LCD will crack, the glue I have used years ago was probably too strong!

Thank you if someone can point me in the right direction!

submitted by /u/Garbia
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