This approach will take an insane amount of power compared to a real switch
I measured on my server each sfp+ card takes 10W, plus my ASRock BTC motherboard (which I bought for the many PCI lanes ignoring the low speeds, making them almost useless for what I wanted to do, a Nas) consumes 40w at idle. So an 8 port switch would take 120w. Not too much but much higher